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lodash: Add thisArg to groupBy and optimize invoke. [jddalton]

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Former-commit-id: 74b0105af083471a56d60ac423409ae39e17d44a
This commit is contained in:
John-David Dalton
2012-04-25 00:08:46 -04:00
parent 774f159e67
commit 313ffb8821
4 changed files with 66 additions and 31 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
build/pre-compile.js
View File

@@ -14,6 +14,7 @@
/** Used to minify variables embedded in compiled strings */
var compiledVars = [
'accumulator',
'args',
'array',
'arrayClass',
'bind',
@@ -37,6 +38,7 @@
'length',
'object',
'Math',
'methodName',
'prop',
'property',
'result',

23
lodash.js
View File

@@ -481,8 +481,10 @@
* // => { '3': ['one', 'two'], '5': ['three'] }
*/
var groupBy = iterationFactory(forEachFactoryOptions, {
'top': 'var prop,isFunc=toString.call(callback)==funcClass',
'init': '{}',
'beforeLoop':
'var prop,isFunc=toString.call(callback)==funcClass;\n' +
'if(isFunc&&thisArg)callback=bind(callback,thisArg)',
'inLoop':
'prop=isFunc?callback(collection[index],index,collection):collection[index][callback];\n' +
'(result[prop]||(result[prop]=[])).push(collection[index])'
@@ -504,14 +506,17 @@
* _.invoke([[5, 1, 7], [3, 2, 1]], 'sort');
* // => [[1, 5, 7], [1, 2, 3]]
*/
function invoke(collection, methodName) {
var args = slice.call(arguments, 2),
isFunc = isFunction(methodName);
return map(collection, function(value) {
return (isFunc ? methodName || value : value[methodName]).apply(value, args);
});
}
var invoke = iterationFactory(mapFactoryOptions, {
'args': 'collection,methodName',
'top': 'var args=slice.call(arguments,2),isFunc=toString.call(methodName)==funcClass',
'inLoop': (function() {
var value = '(isFunc?methodName:collection[index][methodName]).apply(collection[index],args)';
return {
'array': 'result[index]=' + value,
'object': 'result[result.length]=' + value
};
}())
});
/**
* Produces a new array of values by mapping each value in the `collection`

44
lodash.min.js vendored
View File

@@ -2,25 +2,25 @@
Lo-Dash 0.1.0 github.com/bestiejs/lodash/blob/master/LICENSE.txt
Underscore.js 1.3.3 github.com/documentcloud/underscore/blob/master/LICENSE
*/
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28
test/test.js
View File

@@ -87,6 +87,20 @@
/*--------------------------------------------------------------------------*/
QUnit.module('lodash.groupBy');
(function() {
test('supports the `thisArg` argument', function() {
var actual = _.groupBy([1.3, 2.1, 2.4], function(num) {
return this.floor(num);
}, Math);
deepEqual(actual, { '1': [1.3], '2': [2.1, 2.4] });
});
}());
/*--------------------------------------------------------------------------*/
QUnit.module('lodash.initial');
(function() {
@@ -136,6 +150,20 @@
/*--------------------------------------------------------------------------*/
QUnit.module('lodash.sortBy');
(function() {
test('supports the `thisArg` argument', function() {
var actual = _.sortBy([1, 2, 3, 4], function(num) {
return this.sin(num);
}, Math);
deepEqual(actual, [4, 3, 1, 2]);
});
}());
/*--------------------------------------------------------------------------*/
QUnit.module('lodash.toArray');
(function() {