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:

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:

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.

Variables declared with var and let can be reassigned.

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.

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

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

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.

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