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ternary operator
Complete

Concept

Conditional statement:

  • based on the predicate, either the consequent or alternative is returned lazily
  • 3 parameters/operands:
    • boolean predicate
    • consequent
    • alternative
js
predicate ? consequent : alternative;

true ? 1 : 0;
// output: 1

false ? 1 : 0;
// output: 0

Application

Absolute function

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

abs(5);
// output: 5

abs(-8);
// output: 8

Implementing 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