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Operator Precedence

Easy

In plain terms

Operators have a precedence order - multiplication before addition, etc. Use parentheses () to make order explicit and improve readability. When unsure, add parentheses.

What you need to know

  • •*, / before +, -
  • •! before && before ||
  • •Use () for clarity

Try it yourself

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

2 + 3 * 4;   // 14 (3*4 first)
(2 + 3) * 4;  // 20

!true || false;  // false (! has higher precedence)
!(true || false); // false

// Complex - use parentheses for clarity
const result = (a > 0 && b < 10) || (c === null);

Learn more

Dive deeper with these trusted resources:

MDNjavascript.infoTutorialsPointW3Schools