1 | var createWrap = require('./_createWrap');
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2 |
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3 | /** Used to compose bitmasks for function metadata. */
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4 | var WRAP_CURRY_FLAG = 8;
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5 |
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6 | /**
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7 | * Creates a function that accepts arguments of `func` and either invokes
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8 | * `func` returning its result, if at least `arity` number of arguments have
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9 | * been provided, or returns a function that accepts the remaining `func`
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10 | * arguments, and so on. The arity of `func` may be specified if `func.length`
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11 | * is not sufficient.
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12 | *
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13 | * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
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14 | * may be used as a placeholder for provided arguments.
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15 | *
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16 | * **Note:** This method doesn't set the "length" property of curried functions.
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17 | *
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18 | * @static
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19 | * @memberOf _
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20 | * @since 2.0.0
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21 | * @category Function
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22 | * @param {Function} func The function to curry.
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23 | * @param {number} [arity=func.length] The arity of `func`.
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24 | * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
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25 | * @returns {Function} Returns the new curried function.
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26 | * @example
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27 | *
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28 | * var abc = function(a, b, c) {
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29 | * return [a, b, c];
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30 | * };
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31 | *
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32 | * var curried = _.curry(abc);
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33 | *
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34 | * curried(1)(2)(3);
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35 | * // => [1, 2, 3]
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36 | *
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37 | * curried(1, 2)(3);
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38 | * // => [1, 2, 3]
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39 | *
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40 | * curried(1, 2, 3);
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41 | * // => [1, 2, 3]
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42 | *
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43 | * // Curried with placeholders.
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44 | * curried(1)(_, 3)(2);
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45 | * // => [1, 2, 3]
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46 | */
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47 | function curry(func, arity, guard) {
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48 | arity = guard ? undefined : arity;
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49 | var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
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50 | result.placeholder = curry.placeholder;
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51 | return result;
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52 | }
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53 |
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54 | // Assign default placeholders.
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55 | curry.placeholder = {};
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56 |
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57 | module.exports = curry;
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