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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
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23
lodash.js
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@@ -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`