# Conditionals: if/else & switch — JavaScript

Source: https://www.geekswithgeeks.com/en/javascript/js-conditionals

> Branching logic, and a compact alternative.

## if / else if / else

Conditions run top to bottom; the first truthy one wins.

```js
const hour = 14;
if (hour < 12) {
  console.log("Morning");
} else if (hour < 18) {
  console.log("Afternoon");
} else {
  console.log("Evening");
}
```

Output:

```
Afternoon
```

## switch statement

Good for many discrete values on one variable — don't forget `break`, or execution falls through.

```js
switch (day) {
  case "Mon":
  case "Tue":
    console.log("Early week");
    break;
  default:
    console.log("Later");
}
```

## Ternary operator

`condition ? valueIfTrue : valueIfFalse` — a compact if/else for use inside an expression, e.g. `const label = age >= 18 ? "adult" : "minor";`