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R=jacktfranklin@chromium.org No-Presubmit: True Bug: none Change-Id: I52dc24b12e350787085c5e3d131cface7ea87142 Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3060705 Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org> Reviewed-by: Paul Lewis <aerotwist@chromium.org>
27 lines
668 B
JavaScript
27 lines
668 B
JavaScript
'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $RangeError = GetIntrinsic('%RangeError%');
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var ToInteger = require('./ToInteger');
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var ToLength = require('./ToLength');
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var SameValueZero = require('./SameValueZero');
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// https://262.ecma-international.org/8.0/#sec-toindex
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module.exports = function ToIndex(value) {
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if (typeof value === 'undefined') {
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return 0;
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}
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var integerIndex = ToInteger(value);
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if (integerIndex < 0) {
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throw new $RangeError('index must be >= 0');
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}
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var index = ToLength(integerIndex);
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if (!SameValueZero(integerIndex, index)) {
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throw new $RangeError('index must be >= 0 and < 2 ** 53 - 1');
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}
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return index;
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};
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