All 10 Numbers, Math & BigInt questions
More in Numbers, Math & BigInt
Why does 0.1 + 0.2 not equal 0.3 exactly in JavaScript? What does Number.isInteger() check, and how is it different from typeof? What are some commonly used Math object methods? What is Number.MAX_SAFE_INTEGER and what breaks beyond it? Why does 9007199254740993n + 1 throw a TypeError, but 9007199254740993n + 1n does not? Why is Number.parseFloat('123abc') valid but Number('123abc') returns NaN? How do you correctly compare two floating-point numbers for 'close enough' equality? Why is BigInt generally the wrong tool for representing monetary amounts with decimals, like $19.99? How do bitwise operators like >>>, &, and | behave differently on BigInt versus Number?
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JavaScript › Numbers, Math & BigInt

What is BigInt and how do you create one?

Intermediate

Answer

BigInt is a separate numeric type that can represent arbitrarily large integers exactly, with no upper precision limit like regular Numbers. Create one by appending 'n' to an integer literal or calling BigInt(value).
const big = 9007199254740993n;
const big2 = BigInt('9007199254740993');
console.log(big === big2); // true
Real-world example Precisely representing 64-bit database IDs, cryptographic values, or very large financial totals.

Common follow-ups: Can you mix BigInt and Number directly in arithmetic expressions?

ArrayBuffer TypedArrays & Binary Data
All 10 Numbers, Math & BigInt questions