Javascript: Different ways to convert numbers into alphabets

Expectation: 1 -> a, 2 -> b, 3 -> c etc.

(5 + 9).toString(36); -> e

String.fromCharCode(5 + 'A'.charCodeAt()); -> e

In both, replace 5 with other number from 1 - 25. You will get corresponding alphabet.

Always, welcome any new approaches.

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Thanks.