| // 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-string.prototype.substr |
| es6id: B.2.3.1 |
| description: > |
| Behavior when "length" is a false-converting value other than `undefined` |
| info: | |
| [...] |
| 4. If length is undefined, let end be +∞; otherwise let end be ? |
| ToInteger(length). |
| [...] |
| 7. Let resultLength be min(max(end, 0), size - intStart). |
| 8. If resultLength ≤ 0, return the empty String "". |
| 9. Return a String containing resultLength consecutive code units from S |
| beginning with the code unit at index intStart. |
| ---*/ |
| |
| assert.sameValue('abc'.substr(0, false), '', 'start: 0, length: false'); |
| assert.sameValue('abc'.substr(1, false), '', 'start: 1, length: false'); |
| assert.sameValue('abc'.substr(2, false), '', 'start: 2, length: false'); |
| assert.sameValue('abc'.substr(3, false), '', 'start: 3, length: false'); |
| |
| assert.sameValue('abc'.substr(0, NaN), '', 'start: 0, length: NaN'); |
| assert.sameValue('abc'.substr(1, NaN), '', 'start: 1, length: NaN'); |
| assert.sameValue('abc'.substr(2, NaN), '', 'start: 2, length: NaN'); |
| assert.sameValue('abc'.substr(3, NaN), '', 'start: 3, length: NaN'); |
| |
| assert.sameValue('abc'.substr(0, ''), '', 'start: 0, length: ""'); |
| assert.sameValue('abc'.substr(1, ''), '', 'start: 1, length: ""'); |
| assert.sameValue('abc'.substr(2, ''), '', 'start: 2, length: ""'); |
| assert.sameValue('abc'.substr(3, ''), '', 'start: 3, length: ""'); |
| |
| assert.sameValue('abc'.substr(0, null), '', 'start: 0, length: null'); |
| assert.sameValue('abc'.substr(1, null), '', 'start: 1, length: null'); |
| assert.sameValue('abc'.substr(2, null), '', 'start: 2, length: null'); |
| assert.sameValue('abc'.substr(3, null), '', 'start: 3, length: null'); |