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Add "customization callback" support to _.assign.

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Former-commit-id: 5f0c7b72942ba0c40960072b11936f0683909043
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John-David Dalton
2013-02-13 01:17:51 -08:00
parent fe1eb92196
commit a3464780a1
9 changed files with 393 additions and 307 deletions
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40
dist/lodash.underscore.js vendored
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@@ -242,12 +242,20 @@
var assignIteratorOptions = {
'args': 'object, source, guard',
'top':
'var argsIndex = 0,\n' +
'var args = arguments,\n' +
' argsIndex = 0,\n' +
" argsLength = typeof guard == 'number' ? 2 : arguments.length;\n" +
'if (argsLength > 2) {\n' +
" if (typeof args[argsLength - 2] == 'function') {\n" +
' var callback = createCallback(args[--argsLength - 1], args[argsLength--], 2);\n' +
" } else if (typeof args[argsLength - 1] == 'function') {\n" +
' callback = args[--argsLength];\n' +
' }\n' +
'}\n' +
'while (++argsIndex < argsLength) {\n' +
' iterable = arguments[argsIndex];\n' +
' if (iterable && objectTypes[typeof iterable]) {',
'loop': 'result[index] = iterable[index]',
'loop': 'result[index] = callback ? callback(result[index], iterable[index]) : iterable[index]',
'bottom': ' }\n}'
};
@@ -752,9 +760,11 @@
/*--------------------------------------------------------------------------*/
/**
* Assigns own enumerable properties of source object(s) to the `destination`
* Assigns own enumerable properties of source object(s) to the destination
* object. Subsequent sources will overwrite propery assignments of previous
* sources.
* sources. If a `callback` function is passed, it will be executed to produce
* the assigned values. The `callback` is bound to `thisArg` and invoked with
* two arguments; (objectValue, sourceValue).
*
* @static
* @memberOf _
@@ -763,13 +773,21 @@
* @category Objects
* @param {Object} object The destination object.
* @param {Object} [source1, source2, ...] The source objects.
* @param- {Object} [guard] Internally used to allow working with `_.reduce`
* without using its callback's `key and `object` arguments as sources.
* @param {Function} [callback] The function to customize assigning values.
* @param {Mixed} [thisArg] The `this` binding of `callback`.
* @returns {Object} Returns the destination object.
* @example
*
* _.assign({ 'name': 'moe' }, { 'age': 40 });
* // => { 'name': 'moe', 'age': 40 }
*
* var defaults = _.partialRight(_.assign, function(a, b) {
* return typeof a == 'undefined' ? b : a;
* });
*
* var food = { 'name': 'apple' };
* defaults(food, { 'name': 'banana', 'type': 'fruit' });
* // => { 'name': 'apple', 'type': 'fruit' }
*/
function assign(object) {
if (!object) {
@@ -835,8 +853,8 @@
}
/**
* Assigns own enumerable properties of source object(s) to the `destination`
* object for all `destination` properties that resolve to `null`/`undefined`.
* Assigns own enumerable properties of source object(s) to the destination
* object for all destination properties that resolve to `null`/`undefined`.
* Once a property is set, additional defaults of the same property will be
* ignored.
*
@@ -851,9 +869,9 @@
* @returns {Object} Returns the destination object.
* @example
*
* var iceCream = { 'flavor': 'chocolate' };
* _.defaults(iceCream, { 'flavor': 'vanilla', 'sprinkles': 'rainbow' });
* // => { 'flavor': 'chocolate', 'sprinkles': 'rainbow' }
* var food = { 'name': 'apple' };
* _.defaults(food, { 'name': 'banana', 'type': 'fruit' });
* // => { 'name': 'apple', 'type': 'fruit' }
*/
function defaults(object) {
if (!object) {