binary-arith-fold-nan.js

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const values = [

  -Infinity,

  -Number.MAX_VALUE,

  -Number.MIN_VALUE,

-0,

+0,

  +Number.MIN_VALUE,

  +Number.MAX_VALUE

  +Infinity,

  -123,

  -0.5,

  +123,

  +0.5,

];

for (let i = 0; i < 200; ++i) {

  let val = values[i % values.length];

  // rhs is NaN

  assertEq(val + NaN, NaN);

  assertEq(val - NaN, NaN);

  assertEq(val * NaN, NaN);

  assertEq(val / NaN, NaN);

  assertEq(val % NaN, NaN);

  assertEq(val ** NaN, NaN);

  // rhs is undefined, ToNumber(undefined) is NaN

  assertEq(val + undefined, NaN);

  assertEq(val - undefined, NaN);

  assertEq(val * undefined, NaN);

  assertEq(val / undefined, NaN);

  assertEq(val % undefined, NaN);

  assertEq(val ** undefined, NaN);

  // lhs is NaN

  assertEq(NaN + val, NaN);

  assertEq(NaN - val, NaN);

  assertEq(NaN * val, NaN);

  assertEq(NaN / val, NaN);

  assertEq(NaN % val, NaN);

  assertEq(NaN ** val, (val === 0 ? 1 : NaN));

  // lhs is undefined, ToNumber(undefined) is NaN

  assertEq(undefined + val, NaN);

  assertEq(undefined - val, NaN);

  assertEq(undefined * val, NaN);

  assertEq(undefined / val, NaN);

  assertEq(undefined % val, NaN);

  assertEq(undefined ** val, (val === 0 ? 1 : NaN));