How to generate a random number in a given range

// Returns a random number(float) between min (inclusive) and max (exclusive)constgetRandomNumber=(min,max)=>Math.random()*(max-min)+min;getRandomNumber(2,10)// Returns a random number(int) between min (inclusive) and max (inclusive)constgetRandomNumberInclusive=(min,max)=>{min=Math.ceil(min);max=Math.floor(max);returnMath.floor(Math.random()*(max-min+1))+min;}getRandomNumberInclusive(2,10);

How to find the difference between two arrays.

constfirstArr=[5,2,1];constsecondArr=[1,2,3,4,5];constdiff=[    ...secondArr.filter(x=>!firstArr.includes(x)),    ...firstArr.filter(x=>!secondArr.includes(x))];console.log('diff',diff)//[3,4]functionarrayDiff(a,b){return[        ...a.filter(x=>b.indexOf(x)===-1),        ...b.filter(x=>a.indexOf(x)===-1)]}console.log('arrayDiff',arrayDiff(firstArr,secondArr))//[3,4]constdifference=(a,b)=>{constsetA=newSet(a);constsetB=newSet(b);return[        ...a.filter(x=>!setB.has(x)),        ...b.filter(x=>!setA.has(x))]};difference(firstArr,secondArr);//[3,4]console.log('difference',difference(firstArr,secondArr))