Lesson 10

Conditionals

Conditionals allow your program to make decisions and execute different code based on different conditions.

if Statement
if...else Statement
else if Ladder
Nested if
Ternary Operator

Executes a block of code if the condition is true.

if (condition) {  // code}

if...else

Executes code if condition is true, otherwise executes another block.

if (condition) {  // code A} else {  // code B}

else if Ladder

Checks multiple conditions in sequence.

if (cond1) {  // code A} else if (cond2) {  // code B} else {  // code C}

Nested if

An if statement inside another if statement.

if (cond1) {  if (cond2) {    // code  }}

Ternary Operator

A shorthand way to write if...else.

let result =  condition ? val1 : val2;

JavaScript

1let age = 18;
2
3if (age >= 18) {
4  console.log("You are eligible to vote.");
5} else {
6  console.log("You are not eligible to vote yet.");
7}

Output

Your output will appear here...

```
if (condition) { ... }
```
```
if (condition) { ... }else { ... }
```

if (a) { ... } else if (b) { ... }else { ... }

```
condition ? trueValue : falseValue
```

Conditions in JavaScript evaluate to either true or false. Most values are “truthy” except 0, "", null, undefined, NaN, and false.

Conditionals help your program make decisions. Use if for a single condition, if...else for two possibilities, else if for multiple choices, and the ternary operator for simple conditions.