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Insertion Sort in Javascript


Insertion Sort in Javascript

Iterate through elements from second to last, check which is bigger with elements behind and keep replacing until not required.



const insertionSort = (arr) => { // function



  let key, j; // variables



  for(let i=1; i<arr.length; i++) { // iterate from second to last



    key = arr[i]; // value under considereation



    j = i-1; // previous index to i



    while(j >= 0 && arr[j] > key) { // while j is > -1 and value at j > value at i



      arr[j+1] = arr[j]; // setting next value to be value of j



      j = j-1; // reducing j by 1



    }



    arr[j+1] = key; // setting value at next to j to be value at i



  }



  return arr; // return sorted array



}



console.log(insertionSort([7,1,9,8,5,2,4,6,3]));

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