Last change
on this file since 188ee53 was 6a3a178, checked in by Ema <ema_spirova@…>, 3 years ago |
initial commit
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Property mode
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100644
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File size:
978 bytes
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[6a3a178] | 1 | var wellKnownSymbol = require('../internals/well-known-symbol');
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| 2 |
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| 3 | var ITERATOR = wellKnownSymbol('iterator');
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| 4 | var SAFE_CLOSING = false;
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| 5 |
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| 6 | try {
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| 7 | var called = 0;
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| 8 | var iteratorWithReturn = {
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| 9 | next: function () {
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| 10 | return { done: !!called++ };
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| 11 | },
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| 12 | 'return': function () {
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| 13 | SAFE_CLOSING = true;
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| 14 | }
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| 15 | };
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| 16 | iteratorWithReturn[ITERATOR] = function () {
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| 17 | return this;
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| 18 | };
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| 19 | // eslint-disable-next-line es/no-array-from, no-throw-literal -- required for testing
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| 20 | Array.from(iteratorWithReturn, function () { throw 2; });
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| 21 | } catch (error) { /* empty */ }
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| 22 |
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| 23 | module.exports = function (exec, SKIP_CLOSING) {
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| 24 | if (!SKIP_CLOSING && !SAFE_CLOSING) return false;
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| 25 | var ITERATION_SUPPORT = false;
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| 26 | try {
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| 27 | var object = {};
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| 28 | object[ITERATOR] = function () {
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| 29 | return {
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| 30 | next: function () {
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| 31 | return { done: ITERATION_SUPPORT = true };
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| 32 | }
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| 33 | };
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| 34 | };
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| 35 | exec(object);
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| 36 | } catch (error) { /* empty */ }
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| 37 | return ITERATION_SUPPORT;
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| 38 | };
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