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57 lines
1.7 KiB
57 lines
1.7 KiB
import baseRest from './_baseRest.js'; |
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import createWrap from './_createWrap.js'; |
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import getHolder from './_getHolder.js'; |
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import replaceHolders from './_replaceHolders.js'; |
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/** Used to compose bitmasks for function metadata. */ |
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var WRAP_BIND_FLAG = 1, |
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WRAP_PARTIAL_FLAG = 32; |
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/** |
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* Creates a function that invokes `func` with the `this` binding of `thisArg` |
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* and `partials` prepended to the arguments it receives. |
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* |
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* The `_.bind.placeholder` value, which defaults to `_` in monolithic builds, |
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* may be used as a placeholder for partially applied arguments. |
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* |
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* **Note:** Unlike native `Function#bind`, this method doesn't set the "length" |
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* property of bound functions. |
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* |
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* @static |
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* @memberOf _ |
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* @since 0.1.0 |
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* @category Function |
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* @param {Function} func The function to bind. |
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* @param {*} thisArg The `this` binding of `func`. |
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* @param {...*} [partials] The arguments to be partially applied. |
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* @returns {Function} Returns the new bound function. |
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* @example |
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* |
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* function greet(greeting, punctuation) { |
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* return greeting + ' ' + this.user + punctuation; |
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* } |
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* |
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* var object = { 'user': 'fred' }; |
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* |
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* var bound = _.bind(greet, object, 'hi'); |
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* bound('!'); |
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* // => 'hi fred!' |
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* |
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* // Bound with placeholders. |
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* var bound = _.bind(greet, object, _, '!'); |
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* bound('hi'); |
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* // => 'hi fred!' |
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*/ |
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var bind = baseRest(function(func, thisArg, partials) { |
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var bitmask = WRAP_BIND_FLAG; |
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if (partials.length) { |
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var holders = replaceHolders(partials, getHolder(bind)); |
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bitmask |= WRAP_PARTIAL_FLAG; |
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} |
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return createWrap(func, bitmask, thisArg, partials, holders); |
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}); |
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// Assign default placeholders. |
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bind.placeholder = {}; |
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export default bind;
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