GA
const str = 'кроптекста'
const result = str
.split('')
.reduce((acc, item, i) => {
return i < str.length - 1 ? [...acc, item + str[++i ]] : acc
}, [])
console.log(result)
Size: a a a
GA
GA
[...'some text'.split` `.join``].map((e,i,s)=>e+s[i+1]).slice(0,-1)
J
J
GA
J
J
GA
J
GA
GA
J
J
b
O
b
O
b
O