how to write a for loop in a class in javascript code example

Example 1: javascript for loop

var colors=["red","blue","green"];
for (let i = 0; i < colors.length; i++) { 
  console.log(colors[i]);
}

Example 2: loop javascript

//this is javascript
var speed = 100;
setInterval(function() {
//DO SOMETHING THAT REPEATS
},speed);

Example 3: for in loops javascript

for(const key in object){
  	// do stuff
}
// goes through the keys of an object