JavaScript - for statement

In this article, we would like to show you for statement to create loops in JavaScript.

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for ([initial-expression]; [condition-expression]; [final-expression]) {

   // statement

}

Note:

All three expressions in the head of the for loop are optional (initial-expression, condition-expression and final-expression). For more details see the examples below.

In this example, we declare i variable and initialize it with 0. the for statement checks if i is less than 3, performs the statement inside the braces and increments i by 1 after each pass through the loop.

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for (let i = 0; i < 3; ++i) {

  console.log(i);

}

In this example, we skip the initial-expression in the head of the for loop.

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let i = 0

​

for (; i < 3; ++i) {

  console.log(i);

}

In this example, we omit the condition-expression.

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for (let i = 0; ; i++) {

  console.log(i);

  if (i > 3) break;

}

In this example, we omit all three blocks.

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let i = 0;

​

for (;;) {

  if (i > 3) break;

  console.log(i);

  i++;

}

1. for - JavaScript | MDN