JS Custom Array Map Bigmap

1         /**2 * like Map,but prev,curr,next and index would be given3 * @param {Function} cb callback,the Parameters ara Prev,curr,next and Index4 * @return {[type]} [description]5          */6array.prototype.bigmap=function(CB) {7             varcopy = This. Slice (0);8             varLen = This. Length;9              for(vari = 0; i < Len; i++) {Ten                 varCurr = This[i]; One                 varPrev = i==0?undefined: This[I-1]; A                 varNext = i==len?undefined: This[I+1]; -                 varRET =CB (CURR,PREV,NEXT,I); -                 if(ret) { thecopy[i]=ret; -                 } -             } -             returncopy; +         } -  +         //Write a chestnut . A         //[1,2,3,4,7,9,10,50] = ["1-4", "7", "9-10", "[]"] at  -         vararr = [1,2,3,4,7,9,10,50]; -arr = Arr.bigmap (function(curr,prev,next,i) { -             //Console.log (curr+ "--" +prev+ "--" +next+ "--" +i ") -             if(prev+1==Curr) { -                 varRET = "_"; in                 if(next-1!=Curr) { -RET + =Curr; to                 } +                 returnret; -             } the}). Filter (function(obj) { *             returnObj!= "_"; $}). toString (). Replace (/,_/g, "-"). Split (",");Panax Notoginseng  -Console.log (arr)

JS Custom Array Map Bigmap