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