FAQ: Welcome to Codecademy! - Changing colors


#1

This community-built FAQ covers the “Changing colors” exercise from the lesson “Welcome to Codecademy!”.

Paths and Courses
This exercise can be found in the following Codecademy content:

Web Development
Code Foundations

Welcome to Codecademy!

FAQs on the exercise Changing colors

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#2

to define a variable we want to use the keyword var or not
otherwise to declare colour variables


#3

values entered in the color variables are fixed or not???


#4

In global scope a declaration keyword is a bit moot, given that we are are the top of the scope chain and everything declared at this level is global. The only exception here would be anything that we wish to remain constant.

const friction_coefficient = 0.3

var and let are scope declarations that are used inside a function or loop body, respectively, to keep the variables from leaking out of their enclosures.

However, a good many teachers will recommend forming the habit early of declaring variables with a scope declaration regardless where they are declared. That way we avoid the possibility of them ending up in global scope.

function foo() {
    a = 42;
}
console.log(a);    // 42

#5

The values given below,

var red = [0, 100, 63];
var orange = [40, 100, 60];
var green = [75, 100, 40];
var blue = [196, 77, 55];
var purple = [280, 50, 60];

are arbitrarily chosen by the author and resolved in the progam as HSL colors so are not ‘fixed’, as such, but do fit within the color range suggested by the variable name.

In the exercise we actually get to play around a little with the values. Just know that each one has a minimum and a maximum.

[ 0..360, 0..100, 0..100 ]

There are no percent signs in the data above, since the program will resolve them into percentages.