JavaScript · Senior · Question 75 of 75

Is `Array.prototype.sort` stable in modern engines?

✓Correct answer: Yes, since ES2019 equal elements keep their original order
2No, the order of equal elements is random
3Only for arrays shorter than 10 elements

Explanation

Stability enables multi-key sorting: sort by name, then by department, and people within a department stay alphabetical.

Further reading

MDN: Array.prototype.sort() ↗

Test yourself

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