different for loops 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: javascript for loop

for (var i; i < 10; i++) {
  
}

Example 3: loop javascript

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

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