useForOf

Diagnostic Category: lint/style/useForOf

JavaScript (and super languages)

Since: v1.5.0 Sources:

Same as: @typescript-eslint/prefer-for-of
Same as: unicorn/no-for-loop

This rule recommends a for-of loop when in a for loop, the index used to extract an item from the iterated array.

Examples

Invalid

for (let i = 0; i < array.length; i++) {
  console.log(array[i]);
}

code-block.js:1:1 lint/style/useForOf ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ⚠ Use for-of loop instead of a for loop.
  
  > 1 │ for (let i = 0; i < array.length; i++) {
      │ ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  > 2 │   console.log(array[i]);
  > 3 │ }
      │ ^
    4 │

Valid

for (let item of array) {
   console.log(item);
 }

for (let i = 0; i < array.length; i++) {
   console.log(i, array[i]);
 }

for (let i = 0, j = 0; i < array.length; i++) {
   console.log(i, array[i]);
 }

useForOf

Examples

Invalid

Valid

Related links