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35 lines
1.0 KiB
JavaScript
35 lines
1.0 KiB
JavaScript
9 years ago
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var createWrapper = require('../internal/createWrapper'),
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isIterateeCall = require('../internal/isIterateeCall');
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/** Used to compose bitmasks for wrapper metadata. */
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var ARY_FLAG = 128;
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/* Native method references for those with the same name as other `lodash` methods. */
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var nativeMax = Math.max;
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/**
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* Creates a function that accepts up to `n` arguments ignoring any
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* additional arguments.
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*
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* @static
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* @memberOf _
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* @category Function
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* @param {Function} func The function to cap arguments for.
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* @param {number} [n=func.length] The arity cap.
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* @param- {Object} [guard] Enables use as a callback for functions like `_.map`.
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* @returns {Function} Returns the new function.
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* @example
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*
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* _.map(['6', '8', '10'], _.ary(parseInt, 1));
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* // => [6, 8, 10]
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*/
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function ary(func, n, guard) {
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if (guard && isIterateeCall(func, n, guard)) {
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n = undefined;
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}
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n = (func && n == null) ? func.length : nativeMax(+n || 0, 0);
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return createWrapper(func, ARY_FLAG, undefined, undefined, undefined, undefined, n);
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}
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module.exports = ary;
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