Strict mode Passingnon-Strict mode Passing
Features:
- ∅
// Copyright 2009 the Sputnik authors. All rights reserved. // This code is governed by the BSD license found in the LICENSE file. /*--- info: | The shift function is intentionally generic. It does not require that its this value be an Array object esid: sec-array.prototype.shift description: > Operator use ToNumber from length. If Type(value) is Object, evaluate ToPrimitive(value, Number) ---*/ var obj = {}; obj.shift = Array.prototype.shift; obj[0] = -1; obj.length = { valueOf() { return 1 } }; var shift = obj.shift(); assert.sameValue(shift, -1, 'The value of shift is expected to be -1'); obj[0] = -1; obj.length = { valueOf() { return 1 }, toString() { return 0 } }; var shift = obj.shift(); assert.sameValue(shift, -1, 'The value of shift is expected to be -1'); obj[0] = -1; obj.length = { valueOf() { return 1 }, toString() { return {} } }; var shift = obj.shift(); assert.sameValue(shift, -1, 'The value of shift is expected to be -1'); try { obj[0] = -1; obj.length = { valueOf() { return 1 }, toString() { throw "error" } }; var shift = obj.shift(); assert.sameValue(shift, -1, 'The value of shift is expected to be -1'); } catch (e) { assert.notSameValue(e, "error", 'The value of e is not "error"'); } obj[0] = -1; obj.length = { toString() { return 0 } }; var shift = obj.shift(); assert.sameValue(shift, undefined, 'The value of shift is expected to equal undefined'); obj[0] = -1; obj.length = { valueOf() { return {} }, toString() { return 0 } } var shift = obj.shift(); assert.sameValue(shift, undefined, 'The value of shift is expected to equal undefined'); try { obj[0] = -1; obj.length = { valueOf() { throw "error" }, toString() { return 0 } }; var shift = obj.shift(); throw new Test262Error('#7.1: obj[0] = -1; obj.length = {valueOf() {throw "error"}, toString() {return 0}}; obj.shift() throw "error". Actual: ' + (shift)); } catch (e) { assert.sameValue(e, "error", 'The value of e is expected to be "error"'); } try { obj[0] = -1; obj.length = { valueOf() { return {} }, toString() { return {} } }; var shift = obj.shift(); throw new Test262Error('#8.1: obj[0] = -1; obj.length = {valueOf() {return {}}, toString() {return {}}} obj.shift() throw TypeError. Actual: ' + (shift)); } catch (e) { assert.sameValue( e instanceof TypeError, true, 'The result of evaluating (e instanceof TypeError) is expected to be true' ); }