Javascript DataTypes
pavanbaddi
Posted on May 13, 2020
In this tutorial, You'll be learning about using datatypes in Javascript.
Example
let x = 16; //now x is interger
x = 12.65; //now x value is updated to float
x = "JavaScript is Amazing."; //now x value is updated to string
document.write(x);
//output
JavaScript is Amazing.
DataType types
String
Strings are a sequence of characters wrapped in double or single quotes.
Below ways, we can assign Strings.
let task_one = "Complete Homework<br>";
//OR
let task_two = 'Complete Homework<br>';
//OR
let task_three = `Complete Homework<br>`; //this is called string literals
document.write(task_one);
document.write(task_two);
document.write(task_three);
//output
Complete Homework
Complete Homework
Complete Homework
String Concatenation
Using + Operator
let name = "John";
let age = 25;
let sentence = name+" is "+age+" years old";
document.write(sentence);
//output
John is 25 years old
Using String Literals
let name = "John";
let age = 25;
let sentence = `${name} is ${age} years old`;
document.write(sentence);
//output
John is 25 years old
Numbers
Adding two numbers
let a=5,b=7;
let z=a+b;
alert(z);
Add number and string
let a=5;
let b="7";
let z=a+b;
alert(z); //output 57
null type
If we don't want to initialize the value to variable than we can use null which basically means nothing.
let designation=null
alert(designation); // outputs null
undefined type
If we declare variable but don't initialize its value than the value of the variable will be undefined.
let name;
alert(name); //outputs undefined
Boolean Date-Type
Boolean types have two values that are true or false. We can also assign 1 which means true and 0 which means false.
let has_completed_howework=true;
alert(has_completed_howework); //outputs true
We can use this for conditional checking
let has_completed_howework=true;
if(has_completed_howework==true){
alert("Student has completed homework");
}else{
alert("Student has not completed homework");
}
I’ve included link to the whole chapter here.
💖 💪 🙅 🚩
pavanbaddi
Posted on May 13, 2020
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