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Equality and Conditional operators

Equality operators​

The == and === operators check whether two values are the same, but with two definitions of sameness.

  • === strict equality operator, value and type are equivalent
  • == relaxed sameness - allows type conversion
console.log("10" == 10);// true
console.log("10" === 10);// false
note

The === operator does not perform type coercion. It checks both the value and the type of the operands. Since "10" is a string and 10 is a number, their types are different. Therefore, the strict equality operator returns false.

Conditional Operator​

The ?: operator is powerful in web development because it’s an expression, not a statement—so you can use it inline ( in { } ) where if/else simply isn’t allowed.

condition ? expressionIfTrue : expressionIfFalse;

The first operand is evaluated as a boolean. If true, the second operand is evaluated and returned. Otherwise, the third operand is evaluated and returned.

// Instead of the if / else:
greeting = "hello ";
if (username) {
	greeting += username;
} else {
	greeting += "there";
}
// ternary expression
greeting = "hello " + (username ? username : "there");

``