JavaScript
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const arr = [...Array(100)].map((_, i) => i + 1);
const res = arr.map(n => `${n % 3 ? '' : 'Foo'}${n % 5 ? '' : 'Bar'}` || n);const pairs = { a: 'ა', b: 'ბ', g: 'გ'};
const str = 'There are many ways that reading helps you to learn English.';
[...str].map(letter => pairs[letter.toLowerCase()] || letter).join``;const pairs = { a: 'ა', b: 'ბ', g: 'გ'};
const str = 'There are many ways that reading helps you to learn English.';
str.replace(RegExp(Object.keys(pairs).join('|'), 'gi'), letter => pairs[letter.toLowerCase()]);