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Fundamentals · easy

3. Types and coercion

The seven primitives and equality rules.

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Primitives are string, number, boolean, null, undefined, bigint, and symbol. `==` coerces types before comparing; `===` strictly checks type and value.

js
"1" == 1;   // true — coerced
"1" === 1;  // false — different types
typeof 10n; // "bigint"

Token amounts exceed 2^53, so always use `bigint` for wei values.

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Check your understanding

  1. 1. Why use `bigint` for wei amounts?

  2. 2. What does `typeof null` return?

  3. 3. Which comparison avoids coercion?

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