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_PARTIAL_FLAG = 32;
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8 |
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9 | /**
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10 | * Creates a function that invokes `func` with `partials` prepended to the
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11 | * arguments it receives. This method is like `_.bind` except it does **not**
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12 | * alter the `this` binding.
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13 | *
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14 | * The `_.partial.placeholder` value, which defaults to `_` in monolithic
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15 | * builds, may be used as a placeholder for partially applied arguments.
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16 | *
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17 | * **Note:** This method doesn't set the "length" property of partially
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18 | * applied functions.
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19 | *
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20 | * @static
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21 | * @memberOf _
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22 | * @since 0.2.0
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23 | * @category Function
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24 | * @param {Function} func The function to partially apply arguments to.
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25 | * @param {...*} [partials] The arguments to be partially applied.
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26 | * @returns {Function} Returns the new partially applied function.
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27 | * @example
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28 | *
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29 | * function greet(greeting, name) {
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30 | * return greeting + ' ' + name;
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31 | * }
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32 | *
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33 | * var sayHelloTo = _.partial(greet, 'hello');
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34 | * sayHelloTo('fred');
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35 | * // => 'hello fred'
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36 | *
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37 | * // Partially applied with placeholders.
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38 | * var greetFred = _.partial(greet, _, 'fred');
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39 | * greetFred('hi');
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40 | * // => 'hi fred'
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41 | */
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42 | var partial = baseRest(function(func, partials) {
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43 | var holders = replaceHolders(partials, getHolder(partial));
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44 | return createWrap(func, WRAP_PARTIAL_FLAG, undefined, partials, holders);
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45 | });
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46 |
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47 | // Assign default placeholders.
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48 | partial.placeholder = {};
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49 |
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50 | module.exports = partial;
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