Conditional expressions

Conditional logic enables forking the control flow depending on the state, that is, the values available at a given point in the code. Put in a less technical manner, conditionals enable decision making.

A conditional expression is made of three parts:

1. a condition, that is, a boolean expression;
2. an expression evaluated if, and only if, the condition is true;
3. an expression evaluated if, and only if, the condition is false.

The syntax uses a ternary operator with the symbols ? and : to separate the three parts:

const a = 0;

const b = 1;

const min = (a < b) ? a : b; // min == 0

Note: Parentheses are often necessary before ?, but not always: you can either rely on the compiler error message or always use parentheses.