ES6 - for loop


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The for loop executes the code block for a specified number of times. It can be used to iterate over a fixed set of values, such as an array. Following is the syntax of the for loop.

var num = 5
var factorial=1;
for( let i = num ; i >= 1; i-- ) {
   factorial *= i ;
}
console.log(factorial);

The for loop has three parts: the initializer (i = num), the condition ( i>=1) and the final expression (i--).

The program calculates the factorial of the number 5 and displays the same. The for loop generates the sequence of numbers from 5 to 1, calculating the product of the numbers in every iteration.

Multiple assignments and final expressions can be combined in a for loop, by using the comma operator (,). For example, the following for loop prints the first eight Fibonacci numbers −

Example

"use strict"
for(let temp, i = 0, j = 1; j<30; temp = i, i = j, j = i + temp)
console.log(j);

The following output is displayed on successful execution of the above code.

1
1
2
3
5
8
13
21
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