Enforce using the separator argument with Array#join() ​
💼 This rule is enabled in the ✅ recommended config.
🔧 This rule is automatically fixable by the --fix CLI option.
It's better to make it clear what the separator is when calling Array#join(), instead of relying on the default comma (',') separator.
Fail ​
js
const string = array.join();js
const string = Array.prototype.join.call(arrayLike);js
const string = [].join.call(arrayLike);Pass ​
js
const string = array.join(',');js
const string = array.join('|');js
const string = Array.prototype.join.call(arrayLike, '');js
const string = [].join.call(arrayLike, '\n');