CODE FIT PRO

 let a = 20; let b=a; a=30; console.log(b); how to optimize an app how chunks of js files come if we modify only 1 out of 4, if those are cached before promise.all redux storybook code spliting

 const arr= [1,2,3,2,3,4,5,6,6,1,3,2]; let output=arr.reduce((acc,curr)=>{   if(acc[curr]){     acc[curr]+=1;   }   else{     acc[curr]=1;   } return acc; },{}) console.log(output) // const arr =[1,2,3,4,5,6]; // const arrMap =(logic,arr)=>{ //   let output=[]; //   for(let i=0;i<=arr.length,i++){ //     let data= logic(arr[i]); //     output.push(data) //   } //   return output; // } // arrMap((element)=>{ //   element*2; // },arr) const  name='Ankit'.split(''); for(let i=name.length-1;i>=0;i--){   console.log(name[i]) }