将8加到我随机生成的数组中

Question

As the title suggests, I want to add 8 to my randomly generated array. For example if the array produces the following: [8,64,92,3,65,23,76,92]. Underneath this array I want the following to appear [16,72,100,11..etc].

How would I go about doing this. I tried var newarray = arr +8 but this just added 8 to the last value in the array.

var arr = []
    function array() {

while(arr.length < 8){
    var randomnumber = Math.ceil(Math.random()*100)
    if(arr.indexOf(randomnumber) > -1) continue;
    arr[arr.length] = randomnumber;
}
document.getElementById('Output').innerHTML = "Array values before the update:" + "<br>" + arr;
}

Answer 1

simply use like this Array#map

 var a = [8,64,92,3,65,23,76,92]; console.log(a.map(a => a+8)) 

Answer 2

I suggest make use of Array.prototype.map

You can use arrow function:

function add(arr){
    return arr.map(a => a+8));
}

or do this without es6:

function add(arr){
    return arr.map(function(a){
        return a+8;
    });
};