| // Copyright (C) 2015 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| /*--- |
| es6id: 21.1.3.18 |
| description: > |
| Returns false if searchLength + start position is greater than string length. |
| info: | |
| 21.1.3.18 String.prototype.startsWith ( searchString [ , position ] ) |
| |
| ... |
| 11. Let len be the number of elements in S. |
| 12. Let start be min(max(pos, 0), len). |
| 13. Let searchLength be the number of elements in searchStr. |
| 14. If searchLength+start is greater than len, return false. |
| ... |
| ---*/ |
| |
| var str = 'The future is cool!'; |
| |
| assert.sameValue( |
| str.startsWith('!', str.length), false, |
| 'str.startsWith("!", str.length) returns false' |
| ); |
| |
| assert.sameValue( |
| str.startsWith('!', 100), false, |
| 'str.startsWith("!", 100) returns false' |
| ); |
| |
| assert.sameValue( |
| str.startsWith('!', Infinity), false, |
| 'str.startsWith("!", Infinity) returns false' |
| ); |
| |
| assert( |
| str.startsWith('The future', -1), |
| 'position argument < 0 will search from the start of the string (-1)' |
| ); |
| |
| assert( |
| str.startsWith('The future', -Infinity), |
| 'position argument < 0 will search from the start of the string (-Infinity)' |
| ); |