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

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

// Print values 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: undefined

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' can be simply described as 'putting something into a box.'

Here, the box is called a 'variable', and the 'something' can be various types of data such as numbers or texts.

 

## How to Assign?

In JavaScript (and most programming languages), you assign values using the `=` symbol.

Example 1:

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

In the above code, we put the text (value) 'Apple' into a box (variable) called `fruit`.

By using the `=` symbol, we can assign the string value 'Apple' to the `fruit` variable like this.

 

Example 2:

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

Here, we put the numeric value 20 into the box called `age`. In other words, we assigned the number 20 to the variable `age`.

 

## Is Multiple Assignment Possible?

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

```javascript title="Reassigning color variable"
let color = 'Blue';
color = 'Red';
```

Initially, we put the value 'Blue' into the box called `color`.

However, in the next line, we changed the value to 'Red'. As a result, the value of `color` is now 'Red', and the previous 'Blue' value is discarded.

 

## Points to Note

Variables created with `const` cannot be changed once a value is assigned. This is referred to as 'non-reassignable'.

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

 

## Summary

In summary, 'assignment' can be thought of as simply 'putting data into a box.'

Through assignment, you can store information in variables, and later use that information.