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| 2 | |
| 3 |
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| 4 | export function bindCallback(func, thisArg, argCount) {
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| 5 | if (typeof thisArg === 'undefined') {
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| 6 | return func;
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| 7 | }
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| 8 | switch (argCount) {
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| 9 | case 0:
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| 10 | return function () {
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| 11 | return func.call(thisArg);
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| 12 | };
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| 13 | case 1:
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| 14 | return function (arg) {
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| 15 | return func.call(thisArg, arg);
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| 16 | };
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| 17 | case 2:
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| 18 | return function (value, index) {
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| 19 | return func.call(thisArg, value, index);
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| 20 | };
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| 21 | case 3:
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| 22 | return function (value, index, collection) {
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| 23 | return func.call(thisArg, value, index, collection);
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| 24 | };
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| 25 | }
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| 26 | return function () {
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| 27 | return func.apply(thisArg, arguments);
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| 28 | };
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| 29 | }
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| 30 |
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| 31 |
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