Javascript basics

Printing a string.

console.log("Hello World!");

Declare an variable and print it. The keyword var is needed to declare a variale.

var v='hey, this is a string';
console.log(v);

Get the length of a string.

var s='i am a string';
console.log(s.length); //13

Declare a number and print it.

var n=123456;
console.log(n); //123456

if else statement.

var n=9;
if(n%2==0)
{
	console.log(n+" is an even number.");
}
else
{
	console.log(n+" is an odd number.");
}

Declaring arrays.

var strings=['cat','dog','bird']; //an array of strings
var numbers=[2,3,5,6,8]; //an array of numbers
var mix=[23,'hello',37,'kid']; //an array of strings and numbers

for loop.

var numbers=[23,45,67,23,45];
for(var i=0; i<numbers.length; i++)
{
	console.log(numbers[i]);
}

Declaring an object.

var pizza={
	topping:['chicken','pineapple','ham'],
	crust: 'deep dish',
	size: 'large'
}

Accessing properties of an object.

var pizza={
	topping:['chicken','pineapple','ham'],
	crust: 'deep dish',
	size: 'large'
}
console.log(pizza.size);

Declaring a function.

function greeting(name)
{
	console.log("Hello "+name);
}
console.log(greeting('Amy')); //Hello Amy