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Type Conversions

Medium

In plain terms

JavaScript converts types automatically (coercion) or you can convert explicitly with Number(), String(), Boolean(). Understand truthy/falsy values to avoid bugs.

What you need to know

  • •Explicit: Number(), String(), Boolean()
  • •Implicit coercion in expressions
  • •Falsy values

Try it yourself

Copy the code below and run it in your browser console or a code editor:

// Explicit conversion
String(123);      // "123"
Number('42');     // 42
Boolean(1);       // true

// Implicit coercion
'5' + 3;          // "53" (string concatenation)
'5' - 3;          // 2 (numeric subtraction)

// Falsy: false, 0, '', null, undefined, NaN
Boolean('');      // false
Boolean(0);       // false

Learn more

Dive deeper with these trusted resources:

MDNjavascript.infoTutorialsPointW3Schools