Arrays

Basically an array in programming languages is something like a list. In Processing these lists have a specific data type, which means that there can be lists of words, letters, numbers or colors. A mixture of several data types is not possible. So a list for words can contain only words, as well as a list of numbers can contain only numbers.

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Declaring an array

//Processing
String[] cities = {
  "Amsterdam",
  "Paris",
  "Berlin",
  "Münster",
  "Lisbon"
};

//P5.js
let cities = [
  "Amsterdam",
  "Paris",
  "Berlin",
  "Münster",
  "Lisbon"
];

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Alternative

Here’s a alternative way to set the data in an array, which is more flexible.

Processing

String[] cities = new String[5];

void setup(){
   cities[0] = "Amsterdam";
   cities[1] = "Paris";
   cities[2] = "Berlin";
   cities[3] = "Münster";
   cities[4] = "Lisbon";
}

P5.js

let cities = []; 

function setup() {
  cities[0] = "Amsterdam";
  cities[1] = "Paris";
  cities[2] = "Berlin";
  cities[3] = "Münster";
  cities[4] = "Lisbon";
}