1 | var baseRest = require('./_baseRest'),
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2 | createWrap = require('./_createWrap'),
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3 | getHolder = require('./_getHolder'),
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4 | replaceHolders = require('./_replaceHolders');
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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 | module.exports = bind;
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