Programming with JavaScript

Control Flow

Control Flow is the order that computers execute statements in a script. This order is from the first line to the last line unless it encounters a structure or line of code that alters that order.

Functions in JavaScript

A funtion in JavaScript is a codeblock that can be invoked to do something. What that something is is up to the programmer. The sleekness of a function comes from the fact that entire scripts are contained within functions, and these functions can be placed anywhere in the code to carry out their purpose.

Example of Function

function treebully(){
    let name = prompt("What is your name?");
    let tree = prompt("What is your favorite tree?");
    if(tree === "douglas fir" || tree === "birch" || tree ==="willow" || 
        tree === "Douglas Fir" || tree === "Birch" || tree === "Willow") {
        document.write("Well aren't you a coder with excellent taste in trees, " + name + ". That is a good tree");
        }
    else {
        document.write("I'm really sorry " + name + ", but your favorite tree is actually a bad tree");
}

This is a program I wrote asking what someone’s favorite tree is, and based on the user’s input, they will be congratulated, or ‘bullied’. Hence the name of the function that I was then able to drop into HTML, just by placing treebully() in between a script tag.