Remove Duplicate Array Elements

removeDuplicates.js

const removeDuplicates = (inArray) => {
    var arr = inArray.concat()
    for(var i=0; i<arr.length; ++i) { 
        for(var j=i+1; j<arr.length; ++j) { 
            if(arr[i] === arr[j]) {
                arr.splice(j, 1)
            }
        }
    }
    return arr;
}