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[...'abcdefghij'].map((e,i,s)=>e+s[i+1]).slice(0,-1)
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'some text'.replace(/\w+/g, e => e.slice(0,-1))
'some text'.replace(/\w+/g, e => e.slice(-1))
GA
'some text'.replace(/\w+/g, e => e.slice(0,-1))
'some text'.replace(/\w+/g, e => e.slice(-1))
J
J
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[...'some text'.split` `.join``].map((e,i,s)=>e+s[i+1]).slice(0,-1)