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edited Nov 3, 2017 at 7:32

JavaScritJavaScript, 112 bytes

k=>x=>(r=Array(k).fill(''),[...`${x<0?2*~x+1:2*x}`].map((c,i,s)=>r[(s.length-i)%k]+=c),r.map(v=>v&1?~(v/2):v/2))

k=>x=>(r=Array(k).fill(''),[...`${x<0?2*~x+1:2*x}`].map((c,i,s)=>r[(s.length-i)%k]+=c),r.map(v=>v&1?~(v/2):v/2))

k=>x=>(r=Array(k).fill(''),[...`${x<0?2*~x+1:2*x}`].map((c,i,s)=>r[(s.length-i)%k]+=c),r.map(v=>v&1?~(v/2):v/2))

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created Nov 3, 2017 at 7:10

k=>x=>(r=Array(k).fill(''),[...`${x<0?2*~x+1:2*x}`].map((c,i,s)=>r[(s.length-i)%k]+=c),r.map(v=>v&1?~(v/2):v/2))