The for statement creates a loop that consists of three optional expressions, enclosed in parentheses and separated by semicolons, followed by a statement (usually a block statement) to be executed in the loop.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for
for ([initialization]; [condition]; [final-expression]) statement
for (var i = 0; i < coolPeople.length; i++) {
console.log(coolPeople[i]);
}