Insertion Sort

insertionSort.js

const insertionSort = a => {
 var n =  a.length;
  for(var i=1;i<n;i++){
    
    var key = a[i];
    var  j = i-1;
    
    while(j>=0 && a[j]>key){
      a[j+1] = a[j];
      j=j-1;
    }
    
    a[j+1] = key;
  }
  console.log(a);
};

insertionSort([5,3,1,2,6,4])