javascript 2

Nailing the Basics

So how do we define a variable?

Simply type in


    var x = 5

And check it was defined by typing

and you should see the value of x printed

Introducing the 'if' statement


    if(true){
        // run true code
    } else {
        // run false code
    }

Here is an example on our 'x' variable from before


    if(x > 5){
        alert('X was larger than 5');
    } else {
        alert('X was less than or equal to 5');
    }

More rare operators

See here for more details on strict comparison

Need to check two things?

without Boolean logic:


    if(x > 3){
        if(x < 6){
            alert('x was greater than 3 and less than 6');
        }
    }

with Boolean Logic


    if(x > 3 && x < 6){
        alert('x was greater than 3 and less than 6');
    }

Not Operator


            if(!(x > 4)){
                alert('x is not greater than four (x is less than or equal to 4)');
            }