JSTests/test262/test/language/expressions/postfix-decrement/bigint.js

// 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");