Inspectopedia 2025.2 Help

'for..in' is used instead of 'for..of'

Reports a usage of a <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...in">for..in</a> loop on an array. Suggests replacing it with a <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for...of">for..of</a> loop.

for..of loops, which are introduced in ECMAScript 6, iterate over iterable objects. For arrays, this structure is preferable to for..in, because it works only with array values but not with array object's properties.

Locating this inspection

By ID

Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.

ES6ConvertToForOf
Via Settings dialog

Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.

Settings or Preferences | Editor | Inspections | JavaScript and TypeScript | ES2015 migration aids

Inspection ID: ES6ConvertToForOf

Suppressing Inspection

You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:

//noinspection ES6ConvertToForOf

More detailed instructions as well as other ways and options that you have can be found in the product documentation:

Last modified: 18 September 2025