JS Variables
JS variables usually declared by var
var x = 5;
Using ES6 (JS version 2015) variables are declared by let
or const
let x = 5;
//Can be changed
const y = 10;
//Can't be changed
JS Operator
+ Addition
- Subtraction
* Multiplication
** Exponentiation (ES2016)
/ Division
% Modulus (Remainder)
++ Increment
-- Decrement
JS Data Types
JS has basically 4 types of data and more...
var length = 16;
// Number
var lastName = "Johnson";
// String
var x = {firstName:"John", lastName:"Doe"};
// Object
var cars = ["Saab", "Volvo", "BMW"];
// Array
JS Condition
To different action based on different condition we need to use conditional statements.
if (time < 10) {
greeting = "Good morning";
} else if (time < 20) {
greeting = "Good day";
} else {
greeting = "Good evening";
}
JS Loop
To execute same code again & again, loops are used.
for (i = 1; i < 6; i++) {
console.log("Number: "+i);
}
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