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Diffstat (limited to 'test/language/expressions/coalesce/short-circuit-number-string.js')
-rw-r--r-- | test/language/expressions/coalesce/short-circuit-number-string.js | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/test/language/expressions/coalesce/short-circuit-number-string.js b/test/language/expressions/coalesce/short-circuit-number-string.js new file mode 100644 index 000000000..38c60eafe --- /dev/null +++ b/test/language/expressions/coalesce/short-circuit-number-string.js @@ -0,0 +1,82 @@ +// Copyright (C) 2019 Leo Balter. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. + +/*--- +description: > + Short circuit if the CoalesceExpressionHead is not undefined or null (string) +esid: sec-conditional-operator +info: | + ConditionalExpression : + ShortCircuitExpression + ShortCircuitExpression ? AssignmentExpression : AssignmentExpression + + ShortCircuitExpression : + LogicalORExpression + CoalesceExpression + + CoalesceExpression : + CoalesceExpressionHead ?? BitwiseORExpression + + CoalesceExpressionHead : + CoalesceExpression + BitwiseORExpression + + Runtime Semantics: Evaluation + + CoalesceExpression:CoalesceExpressionHead??BitwiseORExpression + + 1. Let lref be the result of evaluating CoalesceExpressionHead. + 2. Let lval be ? GetValue(lref). + 3. If lval is undefined or null, + a. Let rref be the result of evaluating BitwiseORExpression. + b. Return ? GetValue(rref). + 4. Otherwise, return lval. +features: [coalesce-expression] +---*/ + +var x; +var str = 'undefined'; + +x = undefined; +x = str ?? 1; +assert.sameValue(x, str, 'str ?? 1'); + +x = undefined; +x = str ?? null; +assert.sameValue(x, str, 'str ?? null'); + +x = undefined; +x = str ?? undefined; +assert.sameValue(x, str, 'str ?? undefined'); + +x = undefined; +x = str ?? null ?? undefined; +assert.sameValue(x, str, 'str ?? null ?? undefined'); + +x = undefined; +x = str ?? undefined ?? null; +assert.sameValue(x, str, 'str ?? undefined ?? null'); + +x = undefined; +x = str ?? null ?? null; +assert.sameValue(x, str, 'str ?? null ?? null'); + +x = undefined; +x = str ?? undefined ?? undefined; +assert.sameValue(x, str, 'str ?? null ?? null'); + +x = undefined; +x = null ?? str ?? null; +assert.sameValue(x, str, 'null ?? str ?? null'); + +x = undefined; +x = null ?? str ?? undefined; +assert.sameValue(x, str, 'null ?? str ?? undefined'); + +x = undefined; +x = undefined ?? str ?? null; +assert.sameValue(x, str, 'undefined ?? str ?? null'); + +x = undefined; +x = undefined ?? str ?? undefined; +assert.sameValue(x, str, 'undefined ?? str ?? undefined'); |