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 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');