Type Conversion & Coercion — Free JavaScript Tutorial
Learn Type Conversion & Coercion in JavaScript with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
TL;DR: Learn Type Conversion & Coercion in JavaScript with a free, beginner-friendly tutorial, examples and practice for Indian students on Syllab.in.
Written & reviewed by the Syllab.in Academic Team (CBSE/NCERT subject experts) · Updated
Type Conversion & Coercion in JavaScript
JS has two kinds of type change: explicit conversion (you do it on purpose) and implicit coercion (JS does it automatically).
String to Number: `Number("42")` → 42. `parseInt("42px")` → 42. `parseFloat("3.14")` → 3.14. `+"42"` → 42 (unary +).
Number to String: `String(42)` → "42". `(42).toString()` → "42". Template literal: `\`${42}\``.
To Boolean: `Boolean(0)` → false. `Boolean("")` → false. `Boolean(null)` → false. `Boolean([])` → TRUE (empty array is truthy!).
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