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57 行
1.6 KiB
57 行
1.6 KiB
var createWrap = require('./_createWrap');
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/** Used to compose bitmasks for function metadata. */
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var WRAP_CURRY_FLAG = 8;
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/**
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* Creates a function that accepts arguments of `func` and either invokes
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* `func` returning its result, if at least `arity` number of arguments have
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* been provided, or returns a function that accepts the remaining `func`
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* arguments, and so on. The arity of `func` may be specified if `func.length`
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* is not sufficient.
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*
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* The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
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* may be used as a placeholder for provided arguments.
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*
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* **Note:** This method doesn't set the "length" property of curried functions.
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*
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* @static
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* @memberOf _
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* @since 2.0.0
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* @category Function
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* @param {Function} func The function to curry.
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* @param {number} [arity=func.length] The arity of `func`.
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* @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.
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* @returns {Function} Returns the new curried function.
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* @example
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*
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* var abc = function(a, b, c) {
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* return [a, b, c];
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* };
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*
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* var curried = _.curry(abc);
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*
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* curried(1)(2)(3);
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* // => [1, 2, 3]
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*
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* curried(1, 2)(3);
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* // => [1, 2, 3]
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*
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* curried(1, 2, 3);
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* // => [1, 2, 3]
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*
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* // Curried with placeholders.
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* curried(1)(_, 3)(2);
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* // => [1, 2, 3]
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*/
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function curry(func, arity, guard) {
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arity = guard ? undefined : arity;
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var result = createWrap(func, WRAP_CURRY_FLAG, undefined, undefined, undefined, undefined, undefined, arity);
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result.placeholder = curry.placeholder;
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return result;
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}
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// Assign default placeholders.
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curry.placeholder = {};
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module.exports = curry;
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