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// Variable declaration
let a;
let b;
let c;
let d;
let e;

// Assigning values to variables
a = 10;
b = 'Hello, world!';
c;
d = {
  name: 'John Doe',
  age: 30,
};
e = [1, 2, 3];

// Outputting the value of variables
console.log('Number variable a: ' + a); // Number variable a: 10

console.log('String variable b: ' + b); // String variable b: "Hello, world!"

console.log('Boolean variable c: ' + c); // Boolean variable c: true

console.log('Object variable d: ', d); // Object variable d: { name: "John Doe", age: 30 }

console.log('Array variable e: ', e); // Array variable e: [1, 2, 3]

# Variable Assignment

In programming, `assignment` refers to the act of placing data into a variable.

Once a value is assigned to a variable, you can retrieve and use it later when needed.

 

## How Do You Assign a Value?

In JavaScript (and most programming languages), the `=` symbol is used to assign values.

```javascript title="Assigning the string 'apple' to the fruit variable"
let fruit = 'apple';

console.log(fruit); // 'apple'
```

In this code, the box (variable) named `fruit` contains the word 'apple' (value).

We use the `=` symbol here to assign the string value 'apple' to the variable `fruit`.

 

```javascript title="Assigning the number 20 to the age variable"
let age = 20;
```

Here, we're putting the number 20 into the box named `age`. In other words, we're assigning the number 20 to the variable `age`.

 

## Can You Assign a Value Multiple Times?

Variables declared with **var** and **let** can be reassigned.

```javascript title="Reassigning the color variable"
let color = 'blue';
color = 'red';
```

Initially, the box `color` contains the value 'blue'.

On the next line, we put the value 'red' into it. This means `color` now holds 'red', and the previous value 'blue' is gone.

 

## Important Note

Variables created with `const` cannot be reassigned once a value has been assigned. This is known as being 'immutable.'

```javascript title="Variables declared with const cannot be reassigned"
const birthYear = 2000;
birthYear = 2001; // Error occurs!
```

 

## Summary

In simple terms, 'assignment' can be thought of as the act of placing information into a box.

Assignment allows you to store information in a variable and reuse that information later.

In JavaScript, the `=` symbol is used to assign a value to a variable. The variable name is written on the left side of the `=`, and the value to assign is written on the right side.

Variable Assignment

How Do You Assign a Value?

Can You Assign a Value Multiple Times?

Important Note

Summary

How do you assign a value to a variable in JavaScript?