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require-array-join-separator.md

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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

const string = array.join();
const string = Array.prototype.join.call(arrayLike);
const string = [].join.call(arrayLike);

Pass

const string = array.join(',');
const string = array.join('|');
const string = Array.prototype.join.call(arrayLike, '');
const string = [].join.call(arrayLike, '\n');