Functions | W3Schools

We can create and run functions that take a list or instructions and package it into a named command. This is to remove repetitious code and to aid in debugging.

function functionName(){instructions;}

Called by using functionName();

You need the function keyword when you define the function.

The variable naming rules apply to funtions, so they are named using camelCase.

Console.log() -> Shows items inside console.

Practice with Karel -> Link Here

Parameters and Arguments

function functionName(input parameter){somecodethatusestheparameterhere;}

functionName(argument);

When using functions, a parameter is found between the (). When you call the function, the argument goes between the ().

function function(stringa){} -> stringa is the parameter. Parameters are used to take in a value or variable which will then be used somewhere inside of the function.

function(stringb); -> stringb is the argument. This will be used as a variable value in the code.

Functions do not always need to have a parameter. Sometimes, they can stay empty.

Methods

• Math.floor(value); rounds the number down
• Math.ceiling(value); rounds the number up
• Math.pow(base, exponent)
• Math.round(value) -> rounds a number

Return

Functions that can give an output end with a return. This means that the function can both take an input and export an output, and can return a variable or a calculated value.

function getPogs(money){
return money % 2;
}

getPogs(5); //returns 1

Additionally, we are able to use a function (f2) inside of a function(f!), and have our internal function(f2) return a value that is used in the external function(f1). This is useful when we change multiple values and replace them with variable values.

function function1(value){
function2(value);
}

function function2(value){
value+=2;
}

BMI Calculator

BMI = weight kg / height ^2(m^2)

function bmiCalc(height, weight){
var BMI = weight/(height * height);
console.log("Your BMI is " + BMI );
return BMI;
}