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Tweaks to the Annotated Underscore.

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This commit is contained in:
Jeremy Ashkenas
2010-10-05 17:41:11 -04:00
parent 348147d8fb
commit a80550ccd2
4 changed files with 164 additions and 158 deletions
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8
docs/docco.css
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@@ -89,10 +89,10 @@ table td {
font-size: 12px; font-size: 12px;
padding: 0 0.2em; padding: 0 0.2em;
} }
.octowrap { .pilwrap {
position: relative; position: relative;
} }
.octothorpe { .pilcrow {
font: 12px Arial; font: 12px Arial;
text-decoration: none; text-decoration: none;
color: #454545; color: #454545;
@@ -102,11 +102,11 @@ table td {
opacity: 0; opacity: 0;
-webkit-transition: opacity 0.2s linear; -webkit-transition: opacity 0.2s linear;
} }
td.docs:hover .octothorpe { td.docs:hover .pilcrow {
opacity: 1; opacity: 1;
} }
td.code, th.code { td.code, th.code {
padding: 14px 15px 16px 50px; padding: 14px 15px 16px 25px;
width: 100%; width: 100%;
vertical-align: top; vertical-align: top;
background: #f5f5ff; background: #f5f5ff;

233
docs/underscore.html
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File diff suppressed because one or more lines are too long

8
index.html
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@@ -98,8 +98,12 @@
</p> </p>
<p> <p>
The unabridged source code is You may also read through the <a href="docs/underscore.html">annotated source code</a>.
<a href="http://github.com/documentcloud/underscore/">available on GitHub</a>. </p>
<p>
The project is
<a href="http://github.com/documentcloud/underscore/">hosted on GitHub</a>.
</p> </p>
<p> <p>

73
underscore.js
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@@ -32,7 +32,8 @@
hasOwnProperty = ObjProto.hasOwnProperty, hasOwnProperty = ObjProto.hasOwnProperty,
propertyIsEnumerable = ObjProto.propertyIsEnumerable; propertyIsEnumerable = ObjProto.propertyIsEnumerable;
// All ECMA5 native implementations we hope to use are declared here. // All **ECMAScript 5** native function implementations that we hope to use
// are declared here.
var var
nativeForEach = ArrayProto.forEach, nativeForEach = ArrayProto.forEach,
nativeMap = ArrayProto.map, nativeMap = ArrayProto.map,
@@ -52,7 +53,7 @@
// Export the Underscore object for **CommonJS**. // Export the Underscore object for **CommonJS**.
if (typeof exports !== 'undefined') exports._ = _; if (typeof exports !== 'undefined') exports._ = _;
// Export Underscore to global scope. // Export Underscore to the global scope.
root._ = _; root._ = _;
// Current version. // Current version.
@@ -61,9 +62,9 @@
// Collection Functions // Collection Functions
// -------------------- // --------------------
// The cornerstone, an each implementation. // The cornerstone, an `each` implementation.
// Handles objects implementing `forEach`, arrays, and raw objects. // Handles objects implementing `forEach`, arrays, and raw objects.
// Delegates to JavaScript 1.6's native `forEach` if available. // Delegates to **ECMAScript 5**'s native `forEach` if available.
var each = _.forEach = function(obj, iterator, context) { var each = _.forEach = function(obj, iterator, context) {
try { try {
if (nativeForEach && obj.forEach === nativeForEach) { if (nativeForEach && obj.forEach === nativeForEach) {
@@ -82,7 +83,7 @@
}; };
// Return the results of applying the iterator to each element. // Return the results of applying the iterator to each element.
// Delegates to JavaScript 1.6's native `map` if available. // Delegates to **ECMAScript 5**'s native `map` if available.
_.map = function(obj, iterator, context) { _.map = function(obj, iterator, context) {
if (nativeMap && obj.map === nativeMap) return obj.map(iterator, context); if (nativeMap && obj.map === nativeMap) return obj.map(iterator, context);
var results = []; var results = [];
@@ -93,7 +94,7 @@
}; };
// **Reduce** builds up a single result from a list of values, aka `inject`, // **Reduce** builds up a single result from a list of values, aka `inject`,
// or `foldl`. Delegates to JavaScript 1.8's native `reduce` if available. // or `foldl`. Delegates to **ECMAScript 5**'s native `reduce` if available.
_.reduce = function(obj, iterator, memo, context) { _.reduce = function(obj, iterator, memo, context) {
if (nativeReduce && obj.reduce === nativeReduce) { if (nativeReduce && obj.reduce === nativeReduce) {
if (context) iterator = _.bind(iterator, context); if (context) iterator = _.bind(iterator, context);
@@ -106,7 +107,7 @@
}; };
// The right-associative version of reduce, also known as `foldr`. Uses // The right-associative version of reduce, also known as `foldr`. Uses
// Delegates to JavaScript 1.8's native reduceRight if available. // Delegates to **ECMAScript 5**'s native reduceRight if available.
_.reduceRight = function(obj, iterator, memo, context) { _.reduceRight = function(obj, iterator, memo, context) {
if (nativeReduceRight && obj.reduceRight === nativeReduceRight) { if (nativeReduceRight && obj.reduceRight === nativeReduceRight) {
if (context) iterator = _.bind(iterator, context); if (context) iterator = _.bind(iterator, context);
@@ -129,7 +130,7 @@
}; };
// Return all the elements that pass a truth test. // Return all the elements that pass a truth test.
// Delegates to JavaScript 1.6's native filter if available. // Delegates to **ECMAScript 5**'s native `filter` if available.
_.filter = function(obj, iterator, context) { _.filter = function(obj, iterator, context) {
if (nativeFilter && obj.filter === nativeFilter) return obj.filter(iterator, context); if (nativeFilter && obj.filter === nativeFilter) return obj.filter(iterator, context);
var results = []; var results = [];
@@ -149,7 +150,7 @@
}; };
// Determine whether all of the elements match a truth test. // Determine whether all of the elements match a truth test.
// Delegates to JavaScript 1.6's native every if available. // Delegates to **ECMAScript 5**'s native `every` if available.
_.every = function(obj, iterator, context) { _.every = function(obj, iterator, context) {
iterator = iterator || _.identity; iterator = iterator || _.identity;
if (nativeEvery && obj.every === nativeEvery) return obj.every(iterator, context); if (nativeEvery && obj.every === nativeEvery) return obj.every(iterator, context);
@@ -161,7 +162,7 @@
}; };
// Determine if at least one element in the object matches a truth test. // Determine if at least one element in the object matches a truth test.
// Delegates to JavaScript 1.6's native some if available. // Delegates to **ECMAScript 5**'s native `some` if available.
_.some = function(obj, iterator, context) { _.some = function(obj, iterator, context) {
iterator = iterator || _.identity; iterator = iterator || _.identity;
if (nativeSome && obj.some === nativeSome) return obj.some(iterator, context); if (nativeSome && obj.some === nativeSome) return obj.some(iterator, context);
@@ -172,7 +173,7 @@
return result; return result;
}; };
// Determine if a given value is included in the array or object using '==='. // Determine if a given value is included in the array or object using `===`.
_.include = function(obj, target) { _.include = function(obj, target) {
if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1; if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1;
var found = false; var found = false;
@@ -182,7 +183,7 @@
return found; return found;
}; };
// Invoke a method with arguments on every item in a collection. // Invoke a method (with arguments) on every item in a collection.
_.invoke = function(obj, method) { _.invoke = function(obj, method) {
var args = slice.call(arguments, 2); var args = slice.call(arguments, 2);
return _.map(obj, function(value) { return _.map(obj, function(value) {
@@ -190,12 +191,12 @@
}); });
}; };
// Convenience version of a common use case of map: fetching a property. // Convenience version of a common use case of `map`: fetching a property.
_.pluck = function(obj, key) { _.pluck = function(obj, key) {
return _.map(obj, function(value){ return value[key]; }); return _.map(obj, function(value){ return value[key]; });
}; };
// Return the maximum item or (item-based computation). // Return the maximum element or (element-based computation).
_.max = function(obj, iterator, context) { _.max = function(obj, iterator, context) {
if (!iterator && _.isArray(obj)) return Math.max.apply(Math, obj); if (!iterator && _.isArray(obj)) return Math.max.apply(Math, obj);
var result = {computed : -Infinity}; var result = {computed : -Infinity};
@@ -242,7 +243,7 @@
return low; return low;
}; };
// Convert anything iterable into a real, live array. // Safely convert anything iterable into a real, live array.
_.toArray = function(iterable) { _.toArray = function(iterable) {
if (!iterable) return []; if (!iterable) return [];
if (iterable.toArray) return iterable.toArray(); if (iterable.toArray) return iterable.toArray();
@@ -259,17 +260,17 @@
// Array Functions // Array Functions
// --------------- // ---------------
// Get the first element of an array. Passing "n" will return the first N // Get the first element of an array. Passing **n** will return the first N
// values in the array. Aliased as "head". The "guard" check allows it to work // values in the array. Aliased as `head`. The **guard** check allows it to work
// with _.map. // with `_.map`.
_.first = function(array, n, guard) { _.first = function(array, n, guard) {
return n && !guard ? slice.call(array, 0, n) : array[0]; return n && !guard ? slice.call(array, 0, n) : array[0];
}; };
// Returns everything but the first entry of the array. Aliased as "tail". // Returns everything but the first entry of the array. Aliased as `tail`.
// Especially useful on the arguments object. Passing an "index" will return // Especially useful on the arguments object. Passing an **index** will return
// the rest of the values in the array from that index onward. The "guard" // the rest of the values in the array from that index onward. The **guard**
// check allows it to work with _.map. // check allows it to work with `_.map`.
_.rest = function(array, index, guard) { _.rest = function(array, index, guard) {
return slice.call(array, _.isUndefined(index) || guard ? 1 : index); return slice.call(array, _.isUndefined(index) || guard ? 1 : index);
}; };
@@ -332,7 +333,7 @@
// If the browser doesn't supply us with indexOf (I'm looking at you, MSIE), // If the browser doesn't supply us with indexOf (I'm looking at you, MSIE),
// we need this function. Return the position of the first occurence of an // we need this function. Return the position of the first occurence of an
// item in an array, or -1 if the item is not included in the array. // item in an array, or -1 if the item is not included in the array.
// Delegates to JavaScript 1.8's native indexOf if available. // Delegates to **ECMAScript 5**'s native `indexOf` if available.
_.indexOf = function(array, item) { _.indexOf = function(array, item) {
if (nativeIndexOf && array.indexOf === nativeIndexOf) return array.indexOf(item); if (nativeIndexOf && array.indexOf === nativeIndexOf) return array.indexOf(item);
for (var i = 0, l = array.length; i < l; i++) if (array[i] === item) return i; for (var i = 0, l = array.length; i < l; i++) if (array[i] === item) return i;
@@ -340,7 +341,7 @@
}; };
// Delegates to JavaScript 1.6's native lastIndexOf if available. // Delegates to **ECMAScript 5**'s native `lastIndexOf` if available.
_.lastIndexOf = function(array, item) { _.lastIndexOf = function(array, item) {
if (nativeLastIndexOf && array.lastIndexOf === nativeLastIndexOf) return array.lastIndexOf(item); if (nativeLastIndexOf && array.lastIndexOf === nativeLastIndexOf) return array.lastIndexOf(item);
var i = array.length; var i = array.length;
@@ -349,8 +350,8 @@
}; };
// Generate an integer Array containing an arithmetic progression. A port of // Generate an integer Array containing an arithmetic progression. A port of
// the native Python range() function. See: // the native Python `range()` function. See
// http://docs.python.org/library/functions.html#range // [the Python documentation](http://docs.python.org/library/functions.html#range).
_.range = function(start, stop, step) { _.range = function(start, stop, step) {
var a = slice.call(arguments); var a = slice.call(arguments);
var solo = a.length <= 1; var solo = a.length <= 1;
@@ -367,8 +368,8 @@
// Function Functions // Function Functions
// ------------------ // ------------------
// Create a function bound to a given object (assigning 'this', and arguments, // Create a function bound to a given object (assigning `this`, and arguments,
// optionally). Binding with arguments is also known as 'curry'. // optionally). Binding with arguments is also known as `curry`.
_.bind = function(func, obj) { _.bind = function(func, obj) {
var args = slice.call(arguments, 2); var args = slice.call(arguments, 2);
return function() { return function() {
@@ -435,7 +436,7 @@
// ---------------- // ----------------
// Retrieve the names of an object's properties. // Retrieve the names of an object's properties.
// Delegates to ECMA5's native Object.keys // Delegates to **ECMAScript 5**'s native `Object.keys`
_.keys = nativeKeys || function(obj) { _.keys = nativeKeys || function(obj) {
if (_.isArray(obj)) return _.range(0, obj.length); if (_.isArray(obj)) return _.range(0, obj.length);
var keys = []; var keys = [];
@@ -468,7 +469,8 @@
}; };
// Invokes interceptor with the obj, and then returns obj. // Invokes interceptor with the obj, and then returns obj.
// The primary purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain. // The primary purpose of this method is to "tap into" a method chain, in
// order to perform operations on intermediate results within the chain.
_.tap = function(obj, interceptor) { _.tap = function(obj, interceptor) {
interceptor(obj); interceptor(obj);
return obj; return obj;
@@ -582,7 +584,7 @@
// Utility Functions // Utility Functions
// ----------------- // -----------------
// Run Underscore.js in noConflict mode, returning the '_' variable to its // Run Underscore.js in *noConflict* mode, returning the `_` variable to its
// previous owner. Returns a reference to the Underscore object. // previous owner. Returns a reference to the Underscore object.
_.noConflict = function() { _.noConflict = function() {
root._ = previousUnderscore; root._ = previousUnderscore;
@@ -594,7 +596,7 @@
return value; return value;
}; };
// Run a function n times. // Run a function **n** times.
_.times = function (n, iterator, context) { _.times = function (n, iterator, context) {
for (var i = 0; i < n; i++) iterator.call(context, i); for (var i = 0; i < n; i++) iterator.call(context, i);
}; };
@@ -627,10 +629,9 @@
interpolate : /<%=([\s\S]+?)%>/g interpolate : /<%=([\s\S]+?)%>/g
}; };
// JavaScript templating a-la ERB, pilfered from John Resig's // JavaScript micro-templating, similar to John Resig's implementation.
// "Secrets of the JavaScript Ninja", page 83. // Underscore templating handles arbitrary delimiters, preserves whitespace,
// Single-quote fix from Rick Strahl's version. // and correctly escapes quotes within interpolated code.
// With alterations for arbitrary delimiters, and to preserve whitespace.
_.template = function(str, data) { _.template = function(str, data) {
var c = _.templateSettings; var c = _.templateSettings;
var tmpl = 'var __p=[],print=function(){__p.push.apply(__p,arguments);};' + var tmpl = 'var __p=[],print=function(){__p.push.apply(__p,arguments);};' +