Three simple solutions to deduplicate js arrays

1. es6 Set to remove duplicates

function removal(arr) {
  return Array.from(new Set(arr))
}
let arr=[1,2,1,3,4,5,5]
removal(arr)//[1, 2, 3, 4]

2. Use filter

[Related course recommendations: JavaScript video tutorial]

function removal(arr){
  return arr.filter((item,index,arr)=>{
      return arr.indexOf(item,0) == index;
  })
}
let arr=[1,2,1,3,4,5,5]
removal(arr)//[1, 2, 3, 4]

3. Using reduce

let newArr = arr.reduce((prev, cur) => {
    prev.indexOf(cur) === -1 && prev.push(cur);
    return prev;
},[]);

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