JSFiddle - React, Tailwind, and code Playground

JavaScript

function populateArray(num, startValue, endValue){
    var j,
        localArray=[];
    for(j=0; j <= num; j++){
        var k = randomIntFromInterval(startValue, endValue);
        localArray.push(k);
    }
    return localArray; 
}

//http://stackoverflow.com/a/7228322/402706
function randomIntFromInterval(min,max)
{
    return Math.floor(Math.random()*(max-min+1)+min);
}

console.log(populateArray(10, 8, 12));