InsertionSort.js

var sequence = [3,4,1,2,6,5,8,7,9,0];

function insertionSort() {
  
  for (var j=1;j<sequence.length;j++) {
     var key = sequence[j];
     var i=j-1;
     while( i>=0 && sequence[i]>key ) {
      sequence[i+1] = sequence[i];
      i = i-1;
     }
     sequence[i+1]=key;
    
  }
  
}

insertionSort();

console.log(sequence);