JavaScript Functions

// for example parseInt() is a function, it tries to change a string in a number if it can. 
// Calling parseInt("1"), should return 1 without the quotes, an actual number.

parseInt("4");

> 4

// Remember when we called toFixed() on a number, that method belongs to the number.
// example, 4.25.toFixed();
// You cannot call toFixed() on it's own. So toFixed() is a method.

alert("Good morning Guatemala");

// You should see a window pop-up on your browser.  
// alert() is function that takes in an argument and displays a box with the argument on the browser.

prompt("What is your age?");

// This function will pop a box open that asks user for something and returns the user input.
// In order to use the prompt function correctly let's save the user input in a variable.

var age = prompt("What is your age?");

// calling age would return the user input

confirm("Do you like programming?");

// the confirm function only returns true or false (know as booleans)


// Writing a Function

// When writing multiline code in your Chrome console use shift + enter to make a new line. Once you are ready you can press "enter" to evaluate your code.

var numberSquared = function(number){
  return number * number;
}

// now let's try are function out

numberSquared(4);

> 16

// remember you can also store the functions return value in a variable.  
//

var fourSquared = numberSquared(4);

fourSquared

> 16

// Now try to write a function that divides a number by 2 and returns the calculation.