variables and datatypes in js javascript series 2024

javascript variables and data types tutorial (2024)

introduction
javascript is a versatile programming language that is widely used for web development. one of the fundamental concepts in javascript is understanding variables and data types. in this tutorial, we'll cover:

1. what are variables?
2. how to declare variables.
3. different data types in javascript.
4. type coercion and type checking.

1. what are variables?
variables are containers for storing data values. in javascript, you can declare variables using the keywords `var`, `let`, or `const`.

- **`var`**: function-scoped or globally-scoped.
- **`let`**: block-scoped, introduced in es6 (ecmascript 2015).
- **`const`**: block-scoped and cannot be reassigned after its initial assignment.

2. declaring variables

3. data types in javascript
javascript has several data types that can be categorized into two main types: **primitive** and **reference**.

a. primitive data types
1. **string**: represents text.


2. **number**: represents numeric values (both integers and floats).


3. **boolean**: represents a logical entity and can have two values: `true` or `false`.


4. **undefined**: a variable that has been declared but not assigned a value.


5. **null**: represents the intentional absence of any object value.


6. **symbol**: a unique and immutable data type introduced in es6.


7. **bigint**: represents integers with arbitrary precision.


b. reference data types
1. **object**: a collection of key-value pairs.


2. **array**: a special type of object used to store ordered collections.


3. **function**: a special type of object that can be called.


4. type coercion and type checking

javascript is a dynamically typed language, meaning that variables can hold values of any type and their types can change at runtime.

a. type coercion
type coercion is the automatic or implicit conversion of values from one data type to another.

b. type checking
you c ...

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