Strict mode Passingnon-Strict mode Passing
Features:
- ∅
// 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 not defined 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), 'abc', 'start: 0, length: unspecified'); assert.sameValue('abc'.substr(1), 'bc', 'start: 1, length: unspecified'); assert.sameValue('abc'.substr(2), 'c', 'start: 2, length: unspecified'); assert.sameValue('abc'.substr(3), '', 'start: 3, length: unspecified'); assert.sameValue( 'abc'.substr(0, undefined), 'abc', 'start: 0, length: undefined' ); assert.sameValue( 'abc'.substr(1, undefined), 'bc', 'start: 1, length: undefined' ); assert.sameValue( 'abc'.substr(2, undefined), 'c', 'start: 2, length: undefined' ); assert.sameValue( 'abc'.substr(3, undefined), '', 'start: 3, length: undefined' );