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- // fast apply, http://jsperf.lnkit.com/fast-apply/5
- module.exports = function (fn, args, that) {
- var un = that === undefined;
- switch (args.length) {
- case 0: return un ? fn()
- : fn.call(that);
- case 1: return un ? fn(args[0])
- : fn.call(that, args[0]);
- case 2: return un ? fn(args[0], args[1])
- : fn.call(that, args[0], args[1]);
- case 3: return un ? fn(args[0], args[1], args[2])
- : fn.call(that, args[0], args[1], args[2]);
- case 4: return un ? fn(args[0], args[1], args[2], args[3])
- : fn.call(that, args[0], args[1], args[2], args[3]);
- } return fn.apply(that, args);
- };
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