5 added 4 characters in body
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Javascript 95 Bytes

s=>s.sort((x,y)=>x.length-y.length).reduce((a,e,i)=>{i%2?a.push(e):a.unshift(e);return a;},[]);

s=>s.sort((x,y)=>x.length-y.length).reduce((a,e,i)=>{i%2?a.push(e):a.unshift(e);return a;},[]);

Javascript 95 Bytes

s=>s.sort((x,y)=>x.length-y.length).reduce((a,e,i)=>{i%2?a.push(e):a.unshift(e);return a;},[]);

Javascript 95 Bytes

s=>s.sort((x,y)=>x.length-y.length).reduce((a,e,i)=>{i%2?a.push(e):a.unshift(e);return a;},[]);
4 added 20 characters in body
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Javascript 71 95 Bytes

s=>s.sort().reduce((a,e,i)=>{i%2?a.push(e):a.unshift(e);return a;},[]);

s=>s.sort((x,y)=>x.length-y.length).reduce((a,e,i)=>{i%2?a.push(e):a.unshift(e);return a;},[]);

Javascript 71 Bytes

s=>s.sort().reduce((a,e,i)=>{i%2?a.push(e):a.unshift(e);return a;},[]);

Javascript 95 Bytes

s=>s.sort((x,y)=>x.length-y.length).reduce((a,e,i)=>{i%2?a.push(e):a.unshift(e);return a;},[]);

3 added 4 characters in body
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Javascript 71 Bytes

s=>s.sort().reduce((a,e,i)=>{i%2?a.push(e):a.unshift(e);return a;},[]);

s=>s.sort().reduce((a,e,i)=>{i%2?a.push(e):a.unshift(e);return a;},[]);

Javascript 71 Bytes

s=>s.sort().reduce((a,e,i)=>{i%2?a.push(e):a.unshift(e);return a;},[]);

Javascript 71 Bytes

s=>s.sort().reduce((a,e,i)=>{i%2?a.push(e):a.unshift(e);return a;},[]);
2 (s) >>>> s 2 bytes
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1
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