JavaScript JS Introduction Type Conversion

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JavaScript Beginner 1 min read

Type Conversion

Type Conversion

Explicit

Number("42") → 42
String(42) → "42"
Boolean(0) → false
parseInt("99px") → 99

Falsy Values

false, 0, "", null, undefined, NaN — everything else is truthy.

Example

Number('42')     // 42
parseInt('99px') // 99
String(100)      // '100'
Boolean(0)       // false
Boolean([])      // true (arrays truthy!)

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