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59 lines
1.6 KiB
JavaScript
59 lines
1.6 KiB
JavaScript
// Copyright (C) 2016 Rick Waldron. 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
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esid: sec-update-expressions
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description: Exponentiation Operator expression precedence of update operators
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info: |
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ExponentiationExpression :
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...
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UpdateExpression `**` ExponentiationExpression
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UpdateExpression :
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LeftHandSideExpression `++`
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LeftHandSideExpression `--`
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`++` UnaryExpression
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`--` UnaryExpression
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features: [exponentiation]
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---*/
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var base = 4;
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assert.sameValue(--base ** 2, 9, "(--base ** 2) === 9");
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assert.sameValue(++base ** 2, 16, "(++base ** 2) === 16");
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assert.sameValue(base++ ** 2, 16, "(base++ ** 2) === 16");
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assert.sameValue(base-- ** 2, 25, "(base-- ** 2) === 25");
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base = 4;
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// --base ** --base ** 2 -> 3 ** 2 ** 2 -> 3 ** (2 ** 2) -> 81
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assert.sameValue(
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--base ** --base ** 2,
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Math.pow(3, Math.pow(2, 2)),
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"(--base ** --base ** 2) === Math.pow(3, Math.pow(2, 2))"
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);
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// ++base ** ++base ** 2 -> 3 ** 4 ** 2 -> 3 ** (4 ** 2) -> 43046721
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assert.sameValue(
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++base ** ++base ** 2,
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Math.pow(3, Math.pow(4, 2)),
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"(++base ** ++base ** 2) === Math.pow(3, Math.pow(4, 2))"
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);
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base = 4;
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// base-- ** base-- ** 2 -> 4 ** 3 ** 2 -> 4 ** (3 ** 2) -> 262144
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assert.sameValue(
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base-- ** base-- ** 2,
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Math.pow(4, Math.pow(3, 2)),
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"(base-- ** base-- ** 2) === Math.pow(4, Math.pow(3, 2))"
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);
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// base++ ** base++ ** 2 -> 2 ** 3 ** 2 -> 2 ** (3 ** 2) -> 262144
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assert.sameValue(
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base++ ** base++ ** 2,
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Math.pow(2, Math.pow(3, 2)),
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"(base++ ** base++ ** 2) === Math.pow(2, Math.pow(3, 2))"
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);
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