Mirrors/lodash
1
0
Fork 0
mirror of https://github.com/whoisclebs/lodash.git synced 2026-02-11 19:37:49 +00:00
Code Issues Packages Projects Releases Wiki Activity

adding pervasive safety checks for using Underscore functions on objects that jsut happen to have 'map', 'reduce', or 'filter' etc. properties that aren't functions.

Browse Source
This commit is contained in:
Jeremy Ashkenas
2009-12-08 00:06:34 -05:00
parent 30329c051b
commit 0ed4212ec6
1 changed files with 7 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
underscore.js
View File

@@ -42,7 +42,7 @@
try { try {
if (obj.forEach) { if (obj.forEach) {
obj.forEach(iterator, context); obj.forEach(iterator, context);
} else if (obj.length || obj.length === 0) { } else if (_.isNumber(obj.length)) {
for (var i=0, l=obj.length; i<l; i++) iterator.call(context, obj[i], i, obj); for (var i=0, l=obj.length; i<l; i++) iterator.call(context, obj[i], i, obj);
} else { } else {
var keys = _.keys(obj), l = keys.length; var keys = _.keys(obj), l = keys.length;
@@ -57,7 +57,7 @@
// Return the results of applying the iterator to each element. Use JavaScript // Return the results of applying the iterator to each element. Use JavaScript
// 1.6's version of map, if possible. // 1.6's version of map, if possible.
_.map = function(obj, iterator, context) { _.map = function(obj, iterator, context) {
if (obj && obj.map) return obj.map(iterator, context); if (obj && _.isFunction(obj.map)) return obj.map(iterator, context);
var results = []; var results = [];
_.each(obj, function(value, index, list) { _.each(obj, function(value, index, list) {
results.push(iterator.call(context, value, index, list)); results.push(iterator.call(context, value, index, list));
@@ -68,7 +68,7 @@
// Reduce builds up a single result from a list of values. Also known as // Reduce builds up a single result from a list of values. Also known as
// inject, or foldl. Uses JavaScript 1.8's version of reduce, if possible. // inject, or foldl. Uses JavaScript 1.8's version of reduce, if possible.
_.reduce = function(obj, memo, iterator, context) { _.reduce = function(obj, memo, iterator, context) {
if (obj && obj.reduce) return obj.reduce(_.bind(iterator, context), memo); if (obj && _.isFunction(obj.reduce)) return obj.reduce(_.bind(iterator, context), memo);
_.each(obj, function(value, index, list) { _.each(obj, function(value, index, list) {
memo = iterator.call(context, memo, value, index, list); memo = iterator.call(context, memo, value, index, list);
}); });
@@ -78,7 +78,7 @@
// The right-associative version of reduce, also known as foldr. Uses // The right-associative version of reduce, also known as foldr. Uses
// JavaScript 1.8's version of reduceRight, if available. // JavaScript 1.8's version of reduceRight, if available.
_.reduceRight = function(obj, memo, iterator, context) { _.reduceRight = function(obj, memo, iterator, context) {
if (obj && obj.reduceRight) return obj.reduceRight(_.bind(iterator, context), memo); if (obj && _.isFunction(obj.reduceRight)) return obj.reduceRight(_.bind(iterator, context), memo);
var reversed = _.clone(_.toArray(obj)).reverse(); var reversed = _.clone(_.toArray(obj)).reverse();
_.each(reversed, function(value, index) { _.each(reversed, function(value, index) {
memo = iterator.call(context, memo, value, index, obj); memo = iterator.call(context, memo, value, index, obj);
@@ -101,7 +101,7 @@
// Return all the elements that pass a truth test. Use JavaScript 1.6's // Return all the elements that pass a truth test. Use JavaScript 1.6's
// filter(), if it exists. // filter(), if it exists.
_.select = function(obj, iterator, context) { _.select = function(obj, iterator, context) {
if (obj.filter) return obj.filter(iterator, context); if (obj && _.isFunction(obj.filter)) return obj.filter(iterator, context);
var results = []; var results = [];
_.each(obj, function(value, index, list) { _.each(obj, function(value, index, list) {
iterator.call(context, value, index, list) && results.push(value); iterator.call(context, value, index, list) && results.push(value);
@@ -122,7 +122,7 @@
// JavaScript 1.6's every(), if it is present. // JavaScript 1.6's every(), if it is present.
_.all = function(obj, iterator, context) { _.all = function(obj, iterator, context) {
iterator = iterator || _.identity; iterator = iterator || _.identity;
if (obj.every) return obj.every(iterator, context); if (obj && _.isFunction(obj.every)) return obj.every(iterator, context);
var result = true; var result = true;
_.each(obj, function(value, index, list) { _.each(obj, function(value, index, list) {
if (!(result = result && iterator.call(context, value, index, list))) _.breakLoop(); if (!(result = result && iterator.call(context, value, index, list))) _.breakLoop();
@@ -134,7 +134,7 @@
// JavaScript 1.6's some(), if it exists. // JavaScript 1.6's some(), if it exists.
_.any = function(obj, iterator, context) { _.any = function(obj, iterator, context) {
iterator = iterator || _.identity; iterator = iterator || _.identity;
if (obj.some) return obj.some(iterator, context); if (obj && _.isFunction(obj.some)) return obj.some(iterator, context);
var result = false; var result = false;
_.each(obj, function(value, index, list) { _.each(obj, function(value, index, list) {
if (result = iterator.call(context, value, index, list)) _.breakLoop(); if (result = iterator.call(context, value, index, list)) _.breakLoop();