Counter-controlled repetition (for)

The for statement creates a loop that consists of three optional expressions, enclosed in parentheses and separated by semicolons, followed by a statement or a set of statements executed in the loop:

for (let i: number = 0; i < 9; i++) { 
   console.log(i); 
} 

The preceding code snippet contains a for statement. It starts by declaring the variable i and initializing it to 0. It checks whether i is less than 9, performs the two succeeding statements, and increments i by one after each pass through the loop.