[d565449] | 1 | import baseRest from './_baseRest.js';
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| 2 | import createWrap from './_createWrap.js';
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| 3 | import getHolder from './_getHolder.js';
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| 4 | import replaceHolders from './_replaceHolders.js';
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| 5 |
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| 6 | /** Used to compose bitmasks for function metadata. */
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| 7 | var WRAP_BIND_FLAG = 1,
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| 8 | WRAP_PARTIAL_FLAG = 32;
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| 9 |
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| 10 | /**
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| 11 | * Creates a function that invokes `func` with the `this` binding of `thisArg`
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| 12 | * and `partials` prepended to the arguments it receives.
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| 13 | *
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| 14 | * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds,
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| 15 | * may be used as a placeholder for partially applied arguments.
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| 16 | *
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| 17 | * **Note:** Unlike native `Function#bind`, this method doesn't set the "length"
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| 18 | * property of bound functions.
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| 19 | *
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| 20 | * @static
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| 21 | * @memberOf _
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| 22 | * @since 0.1.0
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| 23 | * @category Function
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| 24 | * @param {Function} func The function to bind.
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| 25 | * @param {*} thisArg The `this` binding of `func`.
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| 26 | * @param {...*} [partials] The arguments to be partially applied.
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| 27 | * @returns {Function} Returns the new bound function.
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| 28 | * @example
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| 29 | *
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| 30 | * function greet(greeting, punctuation) {
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| 31 | * return greeting + ' ' + this.user + punctuation;
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| 32 | * }
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| 33 | *
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| 34 | * var object = { 'user': 'fred' };
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| 35 | *
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| 36 | * var bound = _.bind(greet, object, 'hi');
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| 37 | * bound('!');
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| 38 | * // => 'hi fred!'
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| 39 | *
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| 40 | * // Bound with placeholders.
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| 41 | * var bound = _.bind(greet, object, _, '!');
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| 42 | * bound('hi');
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| 43 | * // => 'hi fred!'
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| 44 | */
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| 45 | var bind = baseRest(function(func, thisArg, partials) {
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| 46 | var bitmask = WRAP_BIND_FLAG;
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| 47 | if (partials.length) {
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| 48 | var holders = replaceHolders(partials, getHolder(bind));
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| 49 | bitmask |= WRAP_PARTIAL_FLAG;
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| 50 | }
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| 51 | return createWrap(func, bitmask, thisArg, partials, holders);
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| 52 | });
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| 53 |
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| 54 | // Assign default placeholders.
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| 55 | bind.placeholder = {};
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| 56 |
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| 57 | export default bind;
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