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40 lines
1.1 KiB
40 lines
1.1 KiB
var toInteger = require('./toInteger'); |
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/** Error message constants. */ |
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var FUNC_ERROR_TEXT = 'Expected a function'; |
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/** |
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* Creates a function that invokes `func`, with the `this` binding and arguments |
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* of the created function, while it's called less than `n` times. Subsequent |
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* calls to the created function return the result of the last `func` invocation. |
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* |
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* @static |
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* @memberOf _ |
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* @since 3.0.0 |
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* @category Function |
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* @param {number} n The number of calls at which `func` is no longer invoked. |
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* @param {Function} func The function to restrict. |
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* @returns {Function} Returns the new restricted function. |
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* @example |
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* |
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* jQuery(element).on('click', _.before(5, addContactToList)); |
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* // => Allows adding up to 4 contacts to the list. |
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*/ |
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function before(n, func) { |
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var result; |
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if (typeof func != 'function') { |
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throw new TypeError(FUNC_ERROR_TEXT); |
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} |
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n = toInteger(n); |
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return function() { |
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if (--n > 0) { |
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result = func.apply(this, arguments); |
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} |
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if (n <= 1) { |
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func = undefined; |
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} |
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return result; |
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}; |
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} |
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module.exports = before;
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