mirror of
https://github.com/whoisclebs/lodash.git
synced 2026-02-02 16:17:50 +00:00
finished off the complete test suite for underscore -- let's polish off the corners and provide some docs
This commit is contained in:
Jeremy Ashkenas
202
underscore.js
202
underscore.js
@@ -10,13 +10,9 @@ window._ = {
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if (obj.forEach) {
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obj.forEach(iterator, context);
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} else if (obj.length) {
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for (var i=0; i<obj.length; i++) {
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iterator.call(context, obj[i], i);
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}
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} else if (obj._each) {
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obj._each(function(value) {
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iterator.call(context, value, index++);
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});
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for (var i=0; i<obj.length; i++) iterator.call(context, obj[i], i);
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} else if (obj.each) {
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obj.each(function(value) { iterator.call(context, value, index++); });
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} else {
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var i = 0;
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for (var key in obj) {
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@@ -68,6 +64,14 @@ window._ = {
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return results;
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},
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// Aka reduce. Inject builds up a single result from a list of values.
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inject : function(obj, memo, iterator, context) {
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_.each(obj, function(value, index) {
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memo = iterator.call(context, memo, value, index);
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});
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return memo;
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},
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// Return the first value which passes a truth test.
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detect : function(obj, iterator, context) {
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var result;
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@@ -91,12 +95,22 @@ window._ = {
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return results;
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},
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// Determine if a given value is included in the object, based on '=='.
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// Return all the elements for which a truth test fails.
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reject : function(obj, iterator, context) {
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var results = [];
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_.each(obj, function(value, index) {
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if (!iterator.call(context, value, index)) results.push(value);
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});
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return results;
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},
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// Determine if a given value is included in the array or object,
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// based on '=='.
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include : function(obj, target) {
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if (_.isArray(obj)) if (obj.indexOf(target) != -1) return true;
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if (_.isArray(obj)) return _.indexOf(obj, target) != -1;
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var found = false;
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_.each(obj, function(value) {
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if (value == target) {
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_.each(obj, function(pair) {
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if (pair.value == target) {
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found = true;
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throw '__break__';
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}
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@@ -104,14 +118,6 @@ window._ = {
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return found;
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},
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// Aka reduce. Inject builds up a single result from a list of values.
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inject : function(obj, memo, iterator, context) {
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_.each(obj, function(value, index) {
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memo = iterator.call(context, memo, value, index);
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});
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return memo;
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},
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// Invoke a method with arguments on every item in a collection.
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invoke : function(obj, method) {
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var args = _.toArray(arguments).slice(2);
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@@ -120,26 +126,6 @@ window._ = {
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});
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},
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// Return the maximum item or (item-based computation).
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max : function(obj, iterator, context) {
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var result;
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_.each(obj, function(value, index) {
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value = iterator ? iterator.call(context, value, index) : value;
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if (result == null || value >= result) result = value;
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});
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return result;
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},
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// Return the minimum element (or element-based computation).
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min : function(obj, iterator, context) {
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var result;
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_.each(obj, function(value, index) {
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value = iterator ? iterator.call(context, value, index) : value;
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if (result == null || value < result) result = value;
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});
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return result;
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},
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// Optimized version of a common use case of map: fetching a property.
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pluck : function(obj, key) {
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var results = [];
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@@ -147,13 +133,26 @@ window._ = {
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return results;
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},
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// Return all the elements for which a truth test fails.
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reject : function(obj, iterator, context) {
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var results = [];
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// Return the maximum item or (item-based computation).
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max : function(obj, iterator, context) {
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if (!iterator && _.isArray(obj)) return Math.max.apply(Math, obj);
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var result;
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_.each(obj, function(value, index) {
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if (!iterator.call(context, value, index)) results.push(value);
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var computed = iterator ? iterator.call(context, value, index) : value;
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if (result == null || computed >= result.computed) result = {value : value, computed : computed};
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});
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return results;
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return result.value;
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},
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// Return the minimum element (or element-based computation).
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min : function(obj, iterator, context) {
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if (!iterator && _.isArray(obj)) return Math.min.apply(Math, obj);
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var result;
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_.each(obj, function(value, index) {
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var computed = iterator ? iterator.call(context, value, index) : value;
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if (result == null || computed < result.computed) result = {value : value, computed : computed};
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});
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return result.value;
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},
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// Sort the object's values by a criteria produced by an iterator.
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@@ -189,7 +188,7 @@ window._ = {
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// Return the number of elements in an object.
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size : function(obj) {
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_.toArray(obj).length;
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return _.toArray(obj).length;
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},
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//------------- The following methods only apply to arrays. -----------------
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@@ -218,10 +217,10 @@ window._ = {
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});
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},
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// Return a version of the array that does not contain the specified value.
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// Return a version of the array that does not contain the specified value(s).
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without : function(array) {
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var values = array.slice.call(arguments, 0);
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return _.select(function(value){ return !_.include(values, value); });
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return _.select(array, function(value){ return !_.include(values, value); });
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},
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// Produce a duplicate-free version of the array. If the array has already
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@@ -240,14 +239,38 @@ window._ = {
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});
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},
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// If the browser doesn't supply us with indexOf, we might need this function.
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// Return the position of the first occurence of an item in an array,
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// or -1 if the item is not included in the array.
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// indexOf : function(array, item) {
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// var length = array.length;
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// for (i=0; i<length; i++) if (array[i] === item) return i;
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// return -1;
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// }
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// If the browser doesn't supply us with indexOf (I'm looking at you, MSIE),
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// we need this function. Return the position of the first occurence of an
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// item in an array, or -1 if the item is not included in the array.
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indexOf : function(array, item) {
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if (array.indexOf) return array.indexOf(item);
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var length = array.length;
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for (i=0; i<length; i++) if (array[i] === item) return i;
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return -1;
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},
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/* -------------- The following methods apply to functions -----------------*/
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// Create a function bound to a given object (assigning 'this', and arguments,
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// optionally).
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bind : function(func, context) {
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if (!context) return func;
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var args = _.toArray(arguments).slice(2);
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return function() {
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var a = args.concat(_.toArray(arguments));
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return func.apply(context, a);
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};
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},
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// Bind all of an object's methods to that object. Useful for ensuring that
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// all callbacks defined on an object belong to it.
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bindAll : function() {
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var args = _.toArray(arguments);
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var context = args.pop();
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_.each(args, function(methodName) {
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context[methodName] = _.bind(context[methodName], context);
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});
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},
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/* ---------------- The following methods apply to objects ---------------- */
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@@ -272,6 +295,30 @@ window._ = {
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return _.extend({}, obj);
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},
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// Perform a deep comparison to check if two objects are equal.
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isEqual : function(a, b) {
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// Check object identity.
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if (a === b) return true;
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// Different types?
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var atype = typeof(a), btype = typeof(b);
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if (atype != btype) return false;
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// Basic equality test (watch out for coercions).
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if (a == b) return true;
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// One of them implements an isEqual()?
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if (a.isEqual) return a.isEqual(b);
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// Nothing else worked, deep compare the contents.
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return atype === 'object' && _._isEqualContents(a, b);
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},
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// Objects have equal contents if they have the same keys, and all the values
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// are equal (as defined by _.isEqual).
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_isEqualContents : function(a, b) {
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var aKeys = _.keys(a), bKeys = _.keys(b);
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if (aKeys.length != bKeys.length) return false;
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for (var key in a) if (!_.isEqual(a[key], b[key])) return false;
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return true;
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},
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// Is a given value a DOM element?
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isElement : function(obj) {
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return !!(obj && obj.nodeType == 1);
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@@ -297,26 +344,7 @@ window._ = {
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return obj == null ? '' : String(obj);
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},
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// Create a function bound to a given object (assigning 'this', and arguments,
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// optionally).
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bind : function(func, context) {
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if (!context) return func;
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var args = _.toArray(arguments).slice(2);
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return function() {
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var a = args.concat(_.toArray(arguments));
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return func.apply(context, a);
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};
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},
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// Bind all of an object's methods to that object. Useful for ensuring that
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// all callbacks defined on an object belong to it.
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bindAll : function() {
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var args = _.toArray(arguments);
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var context = args.pop();
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_.each(args, function(methodName) {
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context[methodName] = _.bind(context[methodName], context);
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});
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},
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/* -------------- The following methods are utility methods --------------- */
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// Generate a unique integer id (unique within the entire client session).
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// Useful for temporary DOM ids.
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@@ -325,30 +353,6 @@ window._ = {
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return prefix ? prefix + id : id;
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},
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// Perform a deep comparison to check if two objects are equal.
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isEqual : function(a, b) {
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// Check object identity.
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if (a === b) return true;
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// Different types?
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var at = typeof(a), bt = typeof(b);
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if (at != bt) return false;
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// Basic equality test (watch out for coercions).
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if (a == b) return true;
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// One of them implements an isEqual()?
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if (a.isEqual) return a.isEqual(b);
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// Nothing else worked, deep compare the contents.
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return at === 'object' && _.isEqualContents(a, b);
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},
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// Objects have equal contents if they have the same keys, and all the values
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// are equal (as defined by _.isEqual).
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_isEqualContents : function(a, b) {
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var aKeys = _.keys(a), bKeys = _.keys(b);
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if (aKeys.length != bKeys.length) return false;
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for (var key in a) if (!_.isEqual(a[key], b[key])) return false;
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return true;
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},
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// Javascript templating a-la ERB, pilfered from John Resig's
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// "Secrets of the Javascript Ninja", page 83.
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template : function(str, data) {
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