Javascript-intro.md

Javascript

Basic Code Snippets

While-Loops

// While-Loops

var bool = true;
while(bool){
    console.log("Less is more!");
    bool = false;
}

// or

var yeah = 6
while (yeah>1) {
    console.log("You too, "+yeah);
    yeah--;
}

For-Loops & Arrays

// For-loops & Arrays

var names = ["Lisa", "Julie", "Mateo", "Nic", "Thibaud"];
for (i=0; i<names.length; i++){
    console.log("I know someone called "+names[i]);
}

Functions

// functions

var matheyeah = function (number) {
    var newnumber = number * 10;
    console.log(newnumber);
};

matheyeah(4);

If-Else & Return

// if - else & return
// takes the number 48, processes it in the function
// "quarter" and gives it back to the if loop.

var quarter = function(number) {
    return number/4;
}

if (quarter(48) % 3 === 0 ) {
  console.log("The statement is true");
} else {
  console.log("The statement is false");
}

Switch Statement

var age = prompt("How old are you?");

switch(lunch){
  case '5':
    console.log("That's so young!");
    break;
  case '18':
    console.log("The best age!");
    break;
  default:
    console.log("I'm sure " + age + " is a great age.");
}

Even smaller code snippets (functions)

• isNan checks to see if something is not a number (e.g. isNan("berry") = true, isNan(41) = false)
• var age = prompt("How old are you?"); asks the user a question and puts the answer into the var age.
• Logical operators:
  • and (&&)
  • or (||)
  • not (!), e.g. !true; // => false
• typeof: figures out if something is a string, number, function or object: console.log( typeof someObject ); = Object
• hasOwnProperty: lets us know if an object has a particular property: console.log( myObj.hasOwnProperty('name') );--> can print "true" or "false"
• Public: Public means that properties of an object can be accessed outside the class (default). E.g. this.age = age;.
• Private: Properties that stay private and can only be accessed directly in the class. Defined as a variable, e.g. var bankBalance = 7500;.