JavaScript DataTypes For Beginners

JavaScript is a high-level, interpreted, non-blocking programming language. it is well-known as a scripting language. Here I’m discussing the Data Type of JavaScript for beginners in a simple way.

• Number: Number is a numeric data type. there are floating-point numbers and integer numbers.

Examples:

a = 1.4
b = 2.2
total = a + b = 3.6   // is floating-point numbers
a = 3
b = 4
total = a + b = 7 // is integer numbers.

• String: String represents textual data. you should wrap string by single quote or double quote such as ` ‘Munna’ “Munna” ‘123’ “123” // also a number can be a string when it's warped by quote.

Examples:

var name = "Md riduanul haque"
var name = 'Md riduanul haque'
remember!!!
var a = '1'
var b = '2'
total = a + b = 12 // it;s string. (if its number then ans will be 3)
var firtsName = "Md Riduanul";
var secondName = "Haque"
var fullName = firstName + secondName = "Md Riduanul Haque

• Boolean: Boolean data type is one of two possible values true or false.

Examples

the values of variable yes or no is called true or false. such as
var haveToDrinkCoffee = true;
var haveToDrinkTea = false;
when a answer of a question is yes or no then use the boolean type. true and false. 

• Null: which has a value that indicates a non-value.

Example

var name = 'munna'
if (name == null){
return 0;
}

• Undefined: a value has not been assigned yet.

Example

function name(y) {
  if (y === undefined) {
    return 'Undefined value!';
  }
  return y;
}
let y;
console.log(name(x));
// expected output: "Undefined value!"

• Object: An object is a collection of properties. property has a name and a value.

Example

var Student{
   name = 'munna',
   age = '30',
   phone= 01778899000,
   address = 'rangamati'
}

• Array: where can store multiple values in a single variable. a collection of the same elements.

Example

var myFriends = ['jony', 'rony', 'giny', 'honey'];    // an array
var friendsAge = [23,,33,32,26];     // an array

• Function: A function is a block of code that performs a specific task. suppose you need an additional function to add two numbers. then you can write a function for it.

Example

function sum(a,b){
 total = a + b;
return total;
}
var add = sum(12, 12);
console.log(add);
ans: 24;