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// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-%typedarray%.prototype.lastindexof
description: returns index for the first found element
info: |
22.2.3.17 %TypedArray%.prototype.lastIndexOf ( searchElement [ , fromIndex ] )
%TypedArray%.prototype.lastIndexOf is a distinct function that implements the
same algorithm as Array.prototype.lastIndexOf as defined in 22.1.3.15 except
that the this object's [[ArrayLength]] internal slot is accessed in place of
performing a [[Get]] of "length".
22.1.3.15 Array.prototype.lastIndexOf ( searchElement [ , fromIndex ] )
...
5. If n ≥ 0, then
a. If n is -0, let k be +0; else let k be min(n, len - 1).
6. Else n < 0,
a. Let k be len + n.
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)).
ii. Let same be the result of performing Strict Equality Comparison
searchElement === elementK.
iii. If same is true, return k.
...
includes: [testTypedArray.js]
features: [TypedArray]
---*/
testWithTypedArrayConstructors(function(TA) {
var sample = new TA([42, 43, 42, 41]);
assert.sameValue(sample.lastIndexOf(42), 2, "lastIndexOf(42)");
assert.sameValue(sample.lastIndexOf(43), 1, "lastIndexOf(43)");
assert.sameValue(sample.lastIndexOf(41), 3, "lastIndexOf(41)");
assert.sameValue(sample.lastIndexOf(41, 3), 3, "lastIndexOf(41, 3)");
assert.sameValue(sample.lastIndexOf(41, 4), 3, "lastIndexOf(41, 4)");
assert.sameValue(sample.lastIndexOf(43, 1), 1, "lastIndexOf(43, 1)");
assert.sameValue(sample.lastIndexOf(43, 2), 1, "lastIndexOf(43, 2)");
assert.sameValue(sample.lastIndexOf(43, 3), 1, "lastIndexOf(43, 3)");
assert.sameValue(sample.lastIndexOf(43, 4), 1, "lastIndexOf(43, 4)");
assert.sameValue(sample.lastIndexOf(42, 0), 0, "lastIndexOf(42, 0)");
assert.sameValue(sample.lastIndexOf(42, 1), 0, "lastIndexOf(42, 1)");
assert.sameValue(sample.lastIndexOf(42, 2), 2, "lastIndexOf(42, 2)");
assert.sameValue(sample.lastIndexOf(42, 3), 2, "lastIndexOf(42, 3)");
assert.sameValue(sample.lastIndexOf(42, 4), 2, "lastIndexOf(42, 4)");
assert.sameValue(sample.lastIndexOf(42, -4), 0, "lastIndexOf(42, -4)");
assert.sameValue(sample.lastIndexOf(42, -3), 0, "lastIndexOf(42, -3)");
assert.sameValue(sample.lastIndexOf(42, -2), 2, "lastIndexOf(42, -2)");
assert.sameValue(sample.lastIndexOf(42, -1), 2, "lastIndexOf(42, -1)");
assert.sameValue(sample.lastIndexOf(43, -3), 1, "lastIndexOf(43, -3)");
assert.sameValue(sample.lastIndexOf(43, -2), 1, "lastIndexOf(43, -2)");
assert.sameValue(sample.lastIndexOf(43, -1), 1, "lastIndexOf(43, -1)");
assert.sameValue(sample.lastIndexOf(41, -1), 3, "lastIndexOf(41, -1)");
});
reportCompare(0, 0);
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