Javascript: Find The Closest Number In Array To A Specific Value

closestNumberArray.js

var array = [];

function closest(array,num){
    var i=0;
    var minDiff=1000;
    var ans;
    for(i in array){
         var m=Math.abs(num-array[i]);
         if(m<minDiff){ 
                minDiff=m; 
                ans=array[i]; 
            }
      }
    return ans;
}

/*call array name and desired value to be closet */
alert(closest(array,88));

Thanks.

I came up with this ...
const nearest = (arr) => val => arr.reduce((p,n) => Math.abs(p) > Math.abs(n-val) ? n-val : p, Infinity) + val;

let num = 5;
let arr =[1,2,3,4,5,6,7,8,9,10];
const result = arr.reduce((prev, curr) => Math.abs(curr - num) < Math.abs(prev - num) ? curr : prev);