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curry.js
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define(['../internal/createWrapper', '../internal/isIterateeCall'], function(createWrapper, isIterateeCall) {
/** Used to compose bitmasks for wrapper metadata. */
var CURRY_FLAG = 8;
/**
* Creates a function that accepts one or more arguments of `func` that when
* called either invokes `func` returning its result, if all `func` arguments
* have been provided, or returns a function that accepts one or more of the
* remaining `func` arguments, and so on. The arity of `func` may be specified
* if `func.length` is not sufficient.
*
* The `_.curry.placeholder` value, which defaults to `_` in monolithic builds,
* may be used as a placeholder for provided arguments.
*
* **Note:** This method does not set the `length` property of curried functions.
*
* @static
* @memberOf _
* @category Function
* @param {Function} func The function to curry.
* @param {number} [arity=func.length] The arity of `func`.
* @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
* @returns {Function} Returns the new curried function.
* @example
*
* var abc = function(a, b, c) {
* return [a, b, c];
* };
*
* var curried = _.curry(abc);
*
* curried(1)(2)(3);
* // => [1, 2, 3]
*
* curried(1, 2)(3);
* // => [1, 2, 3]
*
* curried(1, 2, 3);
* // => [1, 2, 3]
*
* // using placeholders
* curried(1)(_, 3)(2);
* // => [1, 2, 3]
*/
function curry(func, arity, guard) {
if (guard && isIterateeCall(func, arity, guard)) {
arity = null;
}
var result = createWrapper(func, CURRY_FLAG, null, null, null, null, null, arity);
result.placeholder = curry.placeholder;
return result;
}
// Assign default placeholders.
curry.placeholder = {};
return curry;
});