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modulo

How to use module? See MDN Operators/Arithmetic/Operators#Remainder

sketch.js

// getting started with p5js
function setup(){
  // executed once
  var canvas = createCanvas(300,100);
  canvas.parent('sketch');
  text("just look into\nthe console", 10,10);
  // console.log(255%100);
var i = 23;
  if(i%2 === 1){
    console.log("odd");
  }else{
    console.log("even");
  }
}


function draw(){
  // executed all the time

}

index.html

<!doctype html>
<html lang="en">
  <head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
    <title>{page.title}</title>
    <meta name="description" content="something">
    <meta name="author" content="me">
  </head>
  <body>
    <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.4.17/p5.min.js"></script>
    <script type="text/javascript" src="sketch.js"></script>
    <div id="sketch"></div>
    </body>
  </html>
odd