1 | var aFunction = require('../internals/a-function');
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2 |
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3 |
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4 | module.exports = function (fn, that, length) {
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5 | aFunction(fn);
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6 | if (that === undefined) return fn;
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7 | switch (length) {
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8 | case 0: return function () {
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9 | return fn.call(that);
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10 | };
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11 | case 1: return function (a) {
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12 | return fn.call(that, a);
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13 | };
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14 | case 2: return function (a, b) {
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15 | return fn.call(that, a, b);
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16 | };
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17 | case 3: return function (a, b, c) {
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18 | return fn.call(that, a, b, c);
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19 | };
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20 | }
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21 | return function (/* ...args */) {
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22 | return fn.apply(that, arguments);
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23 | };
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24 | };
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