Object.is

easycodingJavaScriptComparison~10 min

Asked at Google, Meta, Amazon

Overview

Implement objectIs(a, b) — same as Object.is(a, b). Handles NaN === NaN (true), +0 !== -0.

Examples

objectIs(NaN, NaN); // true
objectIs(+0, -0); // false
objectIs(1, 1); // true

Solution

Reveal solution

function objectIs(a, b) {
  if (a !== a && b !== b) return true;
  if (a === 0 && b === 0) return 1/a === 1/b;
  return a === b;
}

object-is.js

Object.is

easycodingJavaScriptComparison

Overview

Implement objectIs(a, b) — same as Object.is(a, b). Handles NaN === NaN (true), +0 !== -0.

Examples

objectIs(NaN, NaN); // true
objectIs(+0, -0); // false
objectIs(1, 1); // true

Solution

Reveal solution

function objectIs(a, b) {
  if (a !== a && b !== b) return true;
  if (a === 0 && b === 0) return 1/a === 1/b;
  return a === b;
}

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