// Copyright (C) 2017 André Bargull. All rights reserved. // This code is governed by the BSD license found in the LICENSE file. /*--- esid: sec-array.prototype.slice description: > Length property is clamped to 2^53-1, test with indices near 2^53-1 and negative indices and a proxy to an array. info: | ... 2. Let len be ? ToLength(? Get(O, "length")). 3. Let relativeStart be ? ToInteger(start). 4. If relativeStart < 0, let k be max((len + relativeStart), 0); else let k be min(relativeStart, len). 5. If end is undefined, let relativeEnd be len; else let relativeEnd be ? ToInteger(end). 6. If relativeEnd < 0, let final be max((len + relativeEnd), 0); else let final be min(relativeEnd, len). ... includes: [compareArray.js] features: [exponentiation] ---*/ var array = []; array["9007199254740988"] = "9007199254740988"; array["9007199254740989"] = "9007199254740989"; array["9007199254740990"] = "9007199254740990"; array["9007199254740991"] = "9007199254740991"; // Create a proxy to an array object, so IsArray returns true, but we can still // return a length value exceeding the integer limit. var proxy = new Proxy(array, { get(t, pk, r) { if (pk === "length") return 2 ** 53 + 2; return Reflect.get(t, pk, r); } }); var result = Array.prototype.slice.call(proxy, 9007199254740989); assert.compareArray(result, ["9007199254740989", "9007199254740990"], 'The value of result is expected to be ["9007199254740989", "9007199254740990"]'); var result = Array.prototype.slice.call(proxy, 9007199254740989, 9007199254740990); assert.compareArray(result, ["9007199254740989"], 'The value of result is expected to be ["9007199254740989"]'); var result = Array.prototype.slice.call(proxy, 9007199254740989, 9007199254740996); assert.compareArray(result, ["9007199254740989", "9007199254740990"], 'The value of result is expected to be ["9007199254740989", "9007199254740990"]'); var result = Array.prototype.slice.call(proxy, -2); assert.compareArray(result, ["9007199254740989", "9007199254740990"], 'The value of result is expected to be ["9007199254740989", "9007199254740990"]'); var result = Array.prototype.slice.call(proxy, -2, -1); assert.compareArray(result, ["9007199254740989"], 'The value of result is expected to be ["9007199254740989"]'); reportCompare(0, 0);