bigint.js (2605B)
1 // Copyright (C) 2017 Josh Wolfe. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 description: Prefix decrement for references to BigInt values 6 esid: sec-prefix-decrement-operator-runtime-semantics-evaluation 7 info: | 8 1. Let expr be the result of evaluating UnaryExpression. 9 2. Let oldValue be ? ToNumeric(? GetValue(expr)). 10 3. Let newValue be ? Type(oldvalue)::subtract(oldValue, Type(oldValue)::unit). 11 4. Perform ? PutValue(expr, newValue). 12 5. Return newValue. 13 features: [BigInt] 14 ---*/ 15 16 var x = 1n; 17 assert.sameValue(--x, 0n, "var x = 1n; --x === 0n"); 18 assert.sameValue(x, 0n, "var x = 1n; --x; x === 0n"); 19 20 var x = 0n; 21 assert.sameValue(--x, -1n, "var x = 0n; --x === -1n"); 22 assert.sameValue(x, -1n, "var x = 0n; --x; x === -1n"); 23 24 var x = 123457n; 25 assert.sameValue(--x, 123456n, "var x = 123457n; --x === 123456n"); 26 assert.sameValue(x, 123456n, "var x = 123457n; --x; x === 123456n"); 27 28 var x = -123456n; 29 assert.sameValue(--x, -123457n, "var x = -123456n; --x === -123457n"); 30 assert.sameValue(x, -123457n, "var x = -123456n; --x; x === -123457n"); 31 32 var x = 0x1fffffffffffff01n; 33 assert.sameValue(--x, 0x1fffffffffffff00n, "var x = 0x1fffffffffffff01n; --x === 0x1fffffffffffff00n"); 34 assert.sameValue(x, 0x1fffffffffffff00n, "var x = 0x1fffffffffffff01n; --x; x === 0x1fffffffffffff00n"); 35 36 var x = -0x1fffffffffffff00n; 37 assert.sameValue(--x, -0x1fffffffffffff01n, "var x = -0x1fffffffffffff00n; --x === -0x1fffffffffffff01n"); 38 assert.sameValue(x, -0x1fffffffffffff01n, "var x = -0x1fffffffffffff00n; --x; x === -0x1fffffffffffff01n"); 39 40 var x = {y:1n}; 41 assert.sameValue(--x.y, 0n, "var x = {y:1n}; --x.y === 0n"); 42 assert.sameValue(x.y, 0n, "var x = {y:1n}; --x.y; x.y === 0n"); 43 44 var x = {y:{z:1n}}; 45 assert.sameValue(--x.y.z, 0n, "var x = {y:{z:1n}}; --x.y.z === 0n"); 46 assert.sameValue(x.y.z, 0n, "var x = {y:{z:1n}}; --x.y.z; x.y.z === 0n"); 47 48 var x = [1n]; 49 assert.sameValue(--x[0], 0n, "var x = [1n]; --x[0] === 0n"); 50 assert.sameValue(x[0], 0n, "var x = [1n]; --x[0]; x[0] === 0n"); 51 52 var x = [null, [null, null, 1n]]; 53 assert.sameValue(--x[1][2], 0n, "var x = [null, [null, null, 1n]]; --x[1][2] === 0n"); 54 assert.sameValue(x[1][2], 0n, "var x = [null, [null, null, 1n]]; --x[1][2]; x[1][2] === 0n"); 55 56 var x = {y:[1n]}; 57 assert.sameValue(--x.y[0], 0n, "var x = {y:[1n]}; --x.y[0] === 0n"); 58 assert.sameValue(x.y[0], 0n, "var x = {y:[1n]}; --x.y[0]; x.y[0] === 0n"); 59 60 var x = [{z:1n}]; 61 assert.sameValue(--x[0].z, 0n, "var x = [{z:1n}]; --x[0].z === 0n"); 62 assert.sameValue(x[0].z, 0n, "var x = [{z:1n}]; --x[0].z; x[0].z === 0n"); 63 64 reportCompare(0, 0);