Javascript basics

Printing a string.
[code language=”javascript”]
console.log("Hello World!");
[/code]

Declare an variable and print it. The keyword var is needed to declare a variale.
[code language=”javascript”]
var v=’hey, this is a string’;
console.log(v);
[/code]

Get the length of a string.
[code language=”javascript”]
var s=’i am a string’;
console.log(s.length); //13
[/code]

Declare a number and print it.
[code language=”javascript”]
var n=123456;
console.log(n); //123456
[/code]

if else statement.
[code language=”javascript”]
var n=9;
if(n%2==0)
{
console.log(n+" is an even number.");
}
else
{
console.log(n+" is an odd number.");
}
[/code]

Declaring arrays.
[code language=”javascript”]
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
[/code]

for loop.
[code language=”javascript”]
var numbers=[23,45,67,23,45];
for(var i=0; i<numbers.length; i++)
{
console.log(numbers[i]);
}
[/code]

Declaring an object.
[code language=”javascript”]
var pizza={
topping:[‘chicken’,’pineapple’,’ham’],
crust: ‘deep dish’,
size: ‘large’
}
[/code]

Accessing properties of an object.
[code language=”javascript”]
var pizza={
topping:[‘chicken’,’pineapple’,’ham’],
crust: ‘deep dish’,
size: ‘large’
}
console.log(pizza.size);
[/code]

Declaring a function.
[code language=”javascript”]
function greeting(name)
{
console.log("Hello "+name);
}
console.log(greeting(‘Amy’)); //Hello Amy
[/code]