JS Practice — Built-in Objects

String.prototype.localeCompare() — sign of result

📖 Usage Example

'apple'.localeCompare('banana')   // → negative
'banana'.localeCompare('apple')   // → positive
'abc'.localeCompare('abc')        // → 0

Use localeCompare() to compare strings in a locale-aware way, returning negative, zero, or positive.

String.prototype.localeCompare() — Result Sign

The exact number returned is implementation-defined, but the sign is specified: negative, zero, or positive.

Challenge: Implement compareSign(a, b) that returns -1, 0, or 1 based on the sign of a.localeCompare(b).

compareSign('a', 'b') // → -1
compareSign('b', 'b') // → 0
compareSign('c', 'b') // → 1

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