Forks in the Code

The if statement is the foundation of any algorithm. It executes a block of code if the condition in the parentheses is true.

1. The Basics

if (age >= 18) {
  alert('Access granted');
} else {
  alert('You are too young');
}

2. What is considered false (Falsy)?

JS automatically coerces the result in the parentheses to a boolean type. Exactly 6 values in JS turn into false:

1. false
2. 0 (and -0)
3. "" (empty string)
4. null
5. undefined
6. NaN

All other values (including empty objects {} and arrays []) are true.