mirror of https://github.com/jkjoy/sunpeiwen.git
17 lines
701 B
JavaScript
17 lines
701 B
JavaScript
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// fast apply, http://jsperf.lnkit.com/fast-apply/5
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module.exports = function (fn, args, that) {
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var un = that === undefined;
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switch (args.length) {
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case 0: return un ? fn()
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: fn.call(that);
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case 1: return un ? fn(args[0])
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: fn.call(that, args[0]);
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case 2: return un ? fn(args[0], args[1])
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: fn.call(that, args[0], args[1]);
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case 3: return un ? fn(args[0], args[1], args[2])
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: fn.call(that, args[0], args[1], args[2]);
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case 4: return un ? fn(args[0], args[1], args[2], args[3])
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: fn.call(that, args[0], args[1], args[2], args[3]);
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} return fn.apply(that, args);
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};
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