Javascript Numbers

This post will cover topics related to assignment, condition and type checking of Numbers.

Assigning integer and float value to a number.

var salary = 25000; //this is integer value
var average = 2.569; //this is float value 

typeof Reserved Word

Using typeof is a reserved word that used to get the type of variable whether it may be integer, float, object, array and strings etc.

var name = "John";
var age = 21;
var total_marks = 456.26;

console.log(typeof name);
console.log(typeof age);
console.log(typeof total_marks);

NaN reserved word

NaN means Not a Number, these cannot be used to perform the mathematical operation.

var fruit = "orange";
fruit=fruit*2;

By using with if conditions.

var fruit = "orange";
if(isNaN(fruit)){
    console.log("This is not a number");
}else{
    console.log("This is a number");
}

//Console Output
This is not a number

Using === equal to operator

Using === will not only check if the value is equal but also check if is of equal type.

using == equal to operator.

x = "10";
y = 10;
if(x==y){
    console.log("Value of x is equal to y");
}else{
    console.log("Value of x is not equal to y");
}

//Console Output
Value of x is equal to y

using === equal to operator.

x = "10";
y = 10;
if(x===y){
    console.log("Value of x is equal to y");
}else{
    console.log("Value of x is not equal to y");
}

//Console Output
Value of x is not equal to y

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