ternary operator

Complete

Summary

js
true ? 1 : 0;
// output: 1

false ? 1 : 0;
// output: 0

Concept

Ternary operator has 3 parameters/operands:

  • Predicate
  • Consequent
  • Alternative

Based on the boolean predicated, either the consequent or alternative is returned

Application

Absolute function

js
function abs(x) {
	return x >= 0 ? x : -x;
}

abs(5);
// output: 5

abs(-8);
// output: 8

Binary boolean operators

js
a || b // a or b
// is equivalent to
a ? true : b // if a, return true, else return b

a && b // a and b
// is equivalent to
a ? b : false // if a, return b, else return false

lazy evaluation