JSTests/test262/test/built-ins/Array/prototype/fill/coerced-indexes.js

// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-array.prototype.fill
description: >
  Fills elements from coerced to Integer `start` and `end` values
info: |
  22.1.3.6 Array.prototype.fill (value [ , start [ , end ] ] )

  ...
  7. Let relativeStart be ToInteger(start).
  8. ReturnIfAbrupt(relativeStart).
  9. If relativeStart < 0, let k be max((len + relativeStart),0); else let k be
  min(relativeStart, len).
  10. If end is undefined, let relativeEnd be len; else let relativeEnd be
  ToInteger(end).
  ...
includes: [compareArray.js]
---*/

assert(
  compareArray([0, 0].fill(1, undefined), [1, 1]),
  '`undefined` start coerced to 0'
);

assert(
  compareArray([0, 0].fill(1, 0, undefined), [1, 1]),
  'If end is undefined, let relativeEnd be len'
);

assert(
  compareArray([0, 0].fill(1, null), [1, 1]),
  '`null` start coerced to 0'
);

assert(
  compareArray([0, 0].fill(1, 0, null), [0, 0]),
  '`null` end coerced to 0'
);

assert(
  compareArray([0, 0].fill(1, true), [0, 1]),
  '`true` start coerced to 1'
);

assert(
  compareArray([0, 0].fill(1, 0, true), [1, 0]),
  '`true` end coerced to 1'
);

assert(
  compareArray([0, 0].fill(1, false), [1, 1]),
  '`false` start coerced to 0'
);

assert(
  compareArray([0, 0].fill(1, 0, false), [0, 0]),
  '`false` end coerced to 0'
);

assert(
  compareArray([0, 0].fill(1, NaN), [1, 1]),
  '`NaN` start coerced to 0'
);

assert(
  compareArray([0, 0].fill(1, 0, NaN), [0, 0]),
  '`NaN` end coerced to 0'
);

assert(
  compareArray([0, 0].fill(1, '1'), [0, 1]),
  'string start coerced'
);

assert(
  compareArray([0, 0].fill(1, 0, '1'), [1, 0]),
  'string end coerced'
);

assert(
  compareArray([0, 0].fill(1, 1.5), [0, 1]),
  'start as a float number coerced'
);

assert(
  compareArray([0, 0].fill(1, 0, 1.5), [1, 0]),
  'end as a float number coerced'
);