Strict mode Passingnon-Strict mode Passing
Features:
- ∅
// Copyright (C) 2016 the V8 project authors. All rights reserved. // This code is governed by the BSD license found in the LICENSE file. /*--- description: lastIndex is read but not written when global and sticky are unset. es6id: 21.2.5.2.2 info: | 21.2.5.2.2 Runtime Semantics: RegExpBuiltinExec ( R, S ) 4. Let lastIndex be ? ToLength(? Get(R, "lastIndex")). [...] 8. If global is false and sticky is false, let lastIndex be 0. [...] 12. Repeat, while matchSucceeded is false [...] c. If r is failure, then i. If sticky is true, then 1. Perform ? Set(R, "lastIndex", 0, true). 2. Return null. ---*/ var gets = 0; var counter = { valueOf: function() { gets++; return 0; } }; var r = /a/; r.lastIndex = counter; var result = r.exec('nbc'); assert.sameValue(result, null); assert.sameValue(r.lastIndex, counter); assert.sameValue(gets, 1);