Arithmetic, assignment, comparison and logical operators.
✍️ 3 exercises + code challenge in this lesson+ - * / % (remainder) ** (power) ++ --
= += -= *= /=
=== equal value and type, !== not equal, > < >= <=
&& (and), || (or), ! (not), ?? (nullish coalescing)
=== instead of ==. == converts types first, so "5" == 5 is true, which causes bugs.Mastering JavaScript Operators helps you write clean and reliable JavaScript code. Follow standard conventions, test edge cases, and keep logic simple. Try running the code example below and complete the exercises to build confidence.
<pre id="out"></pre>
<script>
const log = (...a) => document.getElementById("out").textContent += a.join(" ") + "\n";
let x = 10;
x += 5;
log("x =", x);
log("17 % 5 =", 17 % 5);
log("2 ** 8 =", 2 ** 8);
log('"5" == 5 →', "5" == 5);
log('"5" === 5 →', "5" === 5);
let age = 20, hasId = true;
log("Can enter:", age >= 18 && hasId);
let nickname = null;
log("Name:", nickname ?? "Guest");
</script>Check what you learned in “JavaScript Operators”.
Use the operator that checks equal value AND type.
if (x 5) { }
What is 17 % 5?
Log 2 to the power of 10 using the ** operator.
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