diff options
Diffstat (limited to 'js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/calls-only-has-on-prototype-after-length-zeroed.js')
-rw-r--r-- | js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/calls-only-has-on-prototype-after-length-zeroed.js | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/calls-only-has-on-prototype-after-length-zeroed.js b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/calls-only-has-on-prototype-after-length-zeroed.js new file mode 100644 index 0000000000..67a77465f5 --- /dev/null +++ b/js/src/tests/test262/built-ins/Array/prototype/lastIndexOf/calls-only-has-on-prototype-after-length-zeroed.js @@ -0,0 +1,45 @@ +// Copyright (C) 2018 André Bargull. All rights reserved. +// This code is governed by the BSD license found in the LICENSE file. + +/*--- +esid: sec-array.prototype.lastindexof +description: > + Calls [[HasProperty]] on the prototype to check for existing elements. +info: | + 22.1.3.15 Array.prototype.lastIndexOf ( searchElement [ , fromIndex ] ) + + ... + 2. Let len be ? ToLength(? Get(O, "length")). + ... + 4. If fromIndex is present, let n be ? ToInteger(fromIndex); else let n be len-1. + ... + 7. Repeat, while k ≥ 0 + a. Let kPresent be ? HasProperty(O, ! ToString(k)). + b. If kPresent is true, then + i. Let elementK be ? Get(O, ! ToString(k)). + ... +includes: [proxyTrapsHelper.js] +features: [Proxy] +---*/ + +var array = [5, undefined, 7]; + +Object.setPrototypeOf(array, new Proxy(Array.prototype, allowProxyTraps({ + has: function(t, pk) { + return pk in t; + } +}))); + +var fromIndex = { + valueOf: function() { + // Zero the array's length. The loop in step 8 iterates over the original + // length value of 100, but the only prototype MOP method which should be + // called is [[HasProperty]]. + array.length = 0; + return 2; + } +}; + +Array.prototype.lastIndexOf.call(array, 100, fromIndex); + +reportCompare(0, 0); |