JavaScript move an item of an array to the front

Question

I want to check if an array contains \"role\". If it does, I want to move the \"role\" to the front of the array.

var data= [\"ema         


        

Answer 1

To check whether an item exists in an array you should to use .includes() instead of in (as already noted here, in is for properties in objects).

This function does what you are looking for: (removes the item from the position it is in and reads in front)

   data = ["email","role","type","name"];
   moveToFirst("role", data)
    
   function moveToFirst(s, r){
      if (r.includes(s)){
        r.splice(r.indexOf(s),1);
        r.unshift(s);
      } 
    }
    
    console.log(data)