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50 lines
1.5 KiB
50 lines
1.5 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_PARTIAL_FLAG = 32; |
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/** |
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* Creates a function that invokes `func` with `partials` prepended to the |
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* arguments it receives. This method is like `_.bind` except it does **not** |
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* alter the `this` binding. |
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* |
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* The `_.partial.placeholder` value, which defaults to `_` in monolithic |
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* builds, may be used as a placeholder for partially applied arguments. |
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* |
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* **Note:** This method doesn't set the "length" property of partially |
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* applied functions. |
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* |
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* @static |
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* @memberOf _ |
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* @since 0.2.0 |
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* @category Function |
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* @param {Function} func The function to partially apply arguments to. |
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* @param {...*} [partials] The arguments to be partially applied. |
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* @returns {Function} Returns the new partially applied function. |
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* @example |
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* |
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* function greet(greeting, name) { |
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* return greeting + ' ' + name; |
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* } |
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* |
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* var sayHelloTo = _.partial(greet, 'hello'); |
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* sayHelloTo('fred'); |
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* // => 'hello fred' |
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* |
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* // Partially applied with placeholders. |
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* var greetFred = _.partial(greet, _, 'fred'); |
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* greetFred('hi'); |
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* // => 'hi fred' |
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*/ |
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var partial = baseRest(function(func, partials) { |
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var holders = replaceHolders(partials, getHolder(partial)); |
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return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders); |
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}); |
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// Assign default placeholders. |
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partial.placeholder = {}; |
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export default partial;
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