what is FOR() 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

var nums = [1, 2, 3, 5];
for (var i = 0; i,nums.length; i++){
	console.log(nums[i]);
}

Example 3: for in js loop

Example:
const object = { a: 1, b: 2, c: 3 };

for (const property in object) {
  console.log(`${property}: ${object[property]}`);
}

// expected output:
// "a: 1"
// "b: 2"
// "c: 3"


Syntax:
for (variable in object)
  statement