bigint.js - mozsearch

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// Copyright (C) 2017 Josh Wolfe. All rights reserved.

// This code is governed by the BSD license found in the LICENSE file.

/*---

description: Postfix decrement for references to BigInt values

esid: sec-postfix-decrement-operator-runtime-semantics-evaluation

info: |

  1. Let expr be the result of evaluating UnaryExpression.

  2. Let oldValue be ? ToNumeric(? GetValue(expr)).

  3. Let newValue be ? Type(oldvalue)::subtract(oldValue, Type(oldValue)::unit).

  4. Perform ? PutValue(expr, newValue).

  5. Return oldValue.

features: [BigInt]

---*/

var x = 1n;

assert.sameValue(x--, 1n, "var x = 1n; x-- === 1n");

assert.sameValue(x, 0n, "var x = 1n; x--; x === 0n");

var x = 0n;

assert.sameValue(x--, 0n, "var x = 0n; x-- === 0n");

assert.sameValue(x, -1n, "var x = 0n; x--; x === -1n");

var x = 123457n;

assert.sameValue(x--, 123457n, "var x = 123457n; x-- === 123457n");

assert.sameValue(x, 123456n, "var x = 123457n; x--; x === 123456n");

var x = -123456n;

assert.sameValue(x--, -123456n, "var x = -123456n; x-- === -123456n");

assert.sameValue(x, -123457n, "var x = -123456n; x--; x === -123457n");

var x = 0x1fffffffffffff01n;

assert.sameValue(x--, 0x1fffffffffffff01n, "var x = 0x1fffffffffffff01n; x-- === 0x1fffffffffffff01n");

assert.sameValue(x, 0x1fffffffffffff00n, "var x = 0x1fffffffffffff01n; x--; x === 0x1fffffffffffff00n");

var x = -0x1fffffffffffff00n;

assert.sameValue(x--, -0x1fffffffffffff00n, "var x = -0x1fffffffffffff00n; x-- === -0x1fffffffffffff00n");

assert.sameValue(x, -0x1fffffffffffff01n, "var x = -0x1fffffffffffff00n; x--; x === -0x1fffffffffffff01n");

var x = {y:1n};

assert.sameValue(x.y--, 1n, "var x = {y:1n}; x.y-- === 1n");

assert.sameValue(x.y, 0n, "var x = {y:1n}; x.y--; x.y === 0n");

var x = {y:{z:1n}};

assert.sameValue(x.y.z--, 1n, "var x = {y:{z:1n}}; x.y.z-- === 1n");

assert.sameValue(x.y.z, 0n, "var x = {y:{z:1n}}; x.y.z--; x.y.z === 0n");

var x = [1n];

assert.sameValue(x[0]--, 1n, "var x = [1n]; x[0]-- === 1n");

assert.sameValue(x[0], 0n, "var x = [1n]; x[0]--; x[0] === 0n");

var x = [null, [null, null, 1n]];

assert.sameValue(x[1][2]--, 1n, "var x = [null, [null, null, 1n]]; x[1][2]-- === 1n");

assert.sameValue(x[1][2], 0n, "var x = [null, [null, null, 1n]]; x[1][2]--; x[1][2] === 0n");

var x = {y:[1n]};

assert.sameValue(x.y[0]--, 1n, "var x = {y:[1n]}; x.y[0]-- === 1n");

assert.sameValue(x.y[0], 0n, "var x = {y:[1n]}; x.y[0]--; x.y[0] === 0n");

var x = [{z:1n}];

assert.sameValue(x[0].z--, 1n, "var x = [{z:1n}]; x[0].z-- === 1n");

assert.sameValue(x[0].z, 0n, "var x = [{z:1n}]; x[0].z--; x[0].z === 0n");

reportCompare(0, 0);