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34 lines
1.5 KiB
JavaScript
34 lines
1.5 KiB
JavaScript
// Copyright (C) 2016 Rick Waldron, André Bargull. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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author: Rick Waldron, André Bargull
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esid: sec-exp-operator-runtime-semantics-evaluation
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description: Exponentiation Operator expression order of evaluation
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info: |
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ExponentiationExpression:
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UpdateExpression ** ExponentiationExpression
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1. Let left be the result of evaluating UpdateExpression.
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2. Let leftValue be ? GetValue(left).
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3. Let right be the result of evaluating ExponentiationExpression.
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4. Let rightValue be ? GetValue(right).
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5. Let base be ? ToNumber(leftValue).
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6. Let exponent be ? ToNumber(rightValue).
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7. Return the result of Applying the ** operator with base and exponent as specified in 12.7.3.4.
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features: [exponentiation]
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---*/
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var capture = [];
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var leftValue = { valueOf() { capture.push("leftValue"); return 3; }};
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var rightValue = { valueOf() { capture.push("rightValue"); return 2; }};
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(capture.push("left"), leftValue) ** (capture.push("right"), rightValue);
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// Expected per operator evaluation order: "left", "right", "leftValue", "rightValue"
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assert.sameValue(capture[0], "left", "Expected the 1st element captured to be 'left'");
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assert.sameValue(capture[1], "right", "Expected the 2nd element captured to be 'right'");
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assert.sameValue(capture[2], "leftValue", "Expected the 3rd element captured to be 'leftValue'");
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assert.sameValue(capture[3], "rightValue", "Expected the 4th element captured to be 'rightValue'");
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