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32 lines
747 B
32 lines
747 B
'use strict';
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var assert = require('assert');
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/**
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* A empty function.
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*
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* @return {Function}
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* @public
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*/
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exports.noop = function noop() {};
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/**
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* Get a function parameter's names.
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*
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* @param {Function} func
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* @param {Boolean} [useCache], default is true
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* @return {Array} names
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*/
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exports.getParamNames = function getParamNames(func, cache) {
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var type = typeof func;
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assert(type === 'function', 'The "func" must be a function. Received type "' + type + '"');
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cache = cache !== false;
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if (cache && func.__cache_names) {
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return func.__cache_names;
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}
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var str = func.toString();
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var names = str.slice(str.indexOf('(') + 1, str.indexOf(')')).match(/([^\s,]+)/g) || [];
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func.__cache_names = names;
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return names;
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};
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