JSTests/test262/test/language/expressions/prefix-increment/bigint.js

// Copyright (C) 2017 Josh Wolfe. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
description: Prefix increment for references to BigInt values
esid: sec-prefix-increment-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)::add(oldValue, Type(oldValue)::unit).
  4. Perform ? PutValue(expr, newValue).
  5. Return newValue.
features: [BigInt]
---*/

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

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

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

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

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

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

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

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

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

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

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

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