var aCallable = require('../internals/a-callable');
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// optional / simple context binding
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module.exports = function (fn, that, length) {
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aCallable(fn);
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if (that === undefined) return fn;
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switch (length) {
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case 0: return function () {
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return fn.call(that);
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};
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case 1: return function (a) {
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return fn.call(that, a);
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};
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case 2: return function (a, b) {
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return fn.call(that, a, b);
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};
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case 3: return function (a, b, c) {
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return fn.call(that, a, b, c);
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};
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}
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return function (/* ...args */) {
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return fn.apply(that, arguments);
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};
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};
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