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Merge branch 'master' of github.com:documentcloud/underscore

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Jeremy Ashkenas
2011-12-05 11:45:11 -05:00
parent 3df51e7004 835f959d2d
commit 4aef322079
3 changed files with 28 additions and 22 deletions
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25
test/collections.js
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@@ -1,4 +1,4 @@
$(document).ready(function() { $(document).ready(function($, undefined) {
module("Collections"); module("Collections");
@@ -8,7 +8,7 @@ $(document).ready(function() {
}); });
var answers = []; var answers = [];
_.each([1, 2, 3], function(num){ answers.push(num * this.multiplier);}, {multiplier : 5}); _.each([1, 2, 3], function(num){ answers.push(num * this.multiplier); }, {multiplier : 5});
equals(answers.join(', '), '5, 10, 15', 'context object property accessed'); equals(answers.join(', '), '5, 10, 15', 'context object property accessed');
answers = []; answers = [];
@@ -75,15 +75,14 @@ $(document).ready(function() {
ifnull = ex; ifnull = ex;
} }
ok(ifnull instanceof TypeError, 'handles a null (without inital value) properly'); ok(ifnull instanceof TypeError, 'handles a null (without inital value) properly');
ok(_.reduce(null, function(){}, 138) === 138, 'handles a null (with initial value) properly'); ok(_.reduce(null, function(){}, 138) === 138, 'handles a null (with initial value) properly');
equals(_.reduce([], function(){}, undefined), undefined, 'undefined can be passed as a special case');
raises(function() { _.reduce([], function(){}); }, TypeError, 'throws an error for empty arrays with no initial value');
// Sparse arrays: var sparseArray = [];
var sparseArray = []; sparseArray[0] = 20;
sparseArray[100] = 10; sparseArray[2] = -5;
sparseArray[200] = 20; equals(_.reduce(sparseArray, function(a, b){ return a - b }), 25, 'initially-sparse arrays with no memo');
equals(_.reduce(sparseArray, function(a, b){ return a + b }), 30, 'initially-sparse arrays with no memo');
}); });
test('collections: reduceRight', function() { test('collections: reduceRight', function() {
@@ -103,8 +102,14 @@ $(document).ready(function() {
ifnull = ex; ifnull = ex;
} }
ok(ifnull instanceof TypeError, 'handles a null (without inital value) properly'); ok(ifnull instanceof TypeError, 'handles a null (without inital value) properly');
ok(_.reduceRight(null, function(){}, 138) === 138, 'handles a null (with initial value) properly'); ok(_.reduceRight(null, function(){}, 138) === 138, 'handles a null (with initial value) properly');
equals(_.reduceRight([], function(){}, undefined), undefined, 'undefined can be passed as a special case');
raises(function() { _.reduceRight([], function(){}); }, TypeError, 'throws an error for empty arrays with no initial value');
var sparseArray = [];
sparseArray[0] = 20;
sparseArray[2] = -5;
equals(_.reduceRight(sparseArray, function(a, b){ return a - b }), -25, 'initially-sparse arrays with no memo');
}); });
test('collections: detect', function() { test('collections: detect', function() {

13
test/objects.js
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@@ -1,18 +1,17 @@
$(document).ready(function() { $(document).ready(function($, undefined) {
module("Objects"); module("Objects");
test("objects: keys", function() { test("objects: keys", function() {
var exception = /object/;
equals(_.keys({one : 1, two : 2}).join(', '), 'one, two', 'can extract the keys from an object'); equals(_.keys({one : 1, two : 2}).join(', '), 'one, two', 'can extract the keys from an object');
// the test above is not safe because it relies on for-in enumeration order // the test above is not safe because it relies on for-in enumeration order
var a = []; a[1] = 0; var a = []; a[1] = 0;
equals(_.keys(a).join(', '), '1', 'is not fooled by sparse arrays; see issue #95'); equals(_.keys(a).join(', '), '1', 'is not fooled by sparse arrays; see issue #95');
raises(function() { _.keys(null); }, exception, 'throws an error for `null` values'); raises(function() { _.keys(null); }, TypeError, 'throws an error for `null` values');
raises(function() { _.keys(void 0); }, exception, 'throws an error for `undefined` values'); raises(function() { _.keys(void 0); }, TypeError, 'throws an error for `undefined` values');
raises(function() { _.keys(1); }, exception, 'throws an error for number primitives'); raises(function() { _.keys(1); }, TypeError, 'throws an error for number primitives');
raises(function() { _.keys('a'); }, exception, 'throws an error for string primitives'); raises(function() { _.keys('a'); }, TypeError, 'throws an error for string primitives');
raises(function() { _.keys(true); }, exception, 'throws an error for boolean primitives'); raises(function() { _.keys(true); }, TypeError, 'throws an error for boolean primitives');
}); });
test("objects: values", function() { test("objects: values", function() {

12
underscore.js
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@@ -167,7 +167,7 @@
// **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 **ECMAScript 5**'s native `reduce` if available. // or `foldl`. Delegates to **ECMAScript 5**'s native `reduce` if available.
_.reduce = _.foldl = _.inject = function(obj, iterator, memo, context) { _.reduce = _.foldl = _.inject = function(obj, iterator, memo, context) {
var initial = memo !== void 0; var initial = arguments.length > 2;
if (obj == null) obj = []; if (obj == null) obj = [];
if (nativeReduce && obj.reduce === nativeReduce) { if (nativeReduce && obj.reduce === nativeReduce) {
if (context) iterator = _.bind(iterator, context); if (context) iterator = _.bind(iterator, context);
@@ -181,20 +181,22 @@
memo = iterator.call(context, memo, value, index, list); memo = iterator.call(context, memo, value, index, list);
} }
}); });
if (!initial) throw new TypeError("Reduce of empty array with no initial value"); if (!initial) throw new TypeError('Reduce of empty array with no initial value');
return memo; return memo;
}; };
// The right-associative version of reduce, also known as `foldr`. // The right-associative version of reduce, also known as `foldr`.
// Delegates to **ECMAScript 5**'s native `reduceRight` if available. // Delegates to **ECMAScript 5**'s native `reduceRight` if available.
_.reduceRight = _.foldr = function(obj, iterator, memo, context) { _.reduceRight = _.foldr = function(obj, iterator, memo, context) {
var initial = arguments.length > 2;
if (obj == null) obj = []; if (obj == null) obj = [];
if (nativeReduceRight && obj.reduceRight === nativeReduceRight) { if (nativeReduceRight && obj.reduceRight === nativeReduceRight) {
if (context) iterator = _.bind(iterator, context); if (context) iterator = _.bind(iterator, context);
return memo !== void 0 ? obj.reduceRight(iterator, memo) : obj.reduceRight(iterator); return initial ? obj.reduceRight(iterator, memo) : obj.reduceRight(iterator);
} }
var reversed = (_.isArray(obj) ? obj.slice() : _.toArray(obj)).reverse(); var reversed = _.toArray(obj).reverse();
return _.reduce(reversed, iterator, memo, context); if (context && !initial) iterator = _.bind(iterator, context);
return initial ? _.reduce(reversed, iterator, memo, context) : _.reduce(reversed, iterator);
}; };
// Return the first value which passes a truth test. Aliased as `detect`. // Return the first value which passes a truth test. Aliased as `detect`.