Max Min Hacker Rank

MaxMin.js

function maxMin(k, arr) {

    const sortArray=arr.sort((a,b)=>a-b);
    const lengthArray=sortArray.length;
    let unfairValue=Infinity;
    for(let i=0; i<=lengthArray-k; i++)
    {
        const groupArray=sortArray.slice(i,i+k);
        const value=groupArray[k-1]-groupArray[0];
        unfairValue=unfairValue<value?unfairValue:value;
        if(unfairValue===0)break;
    }
    return unfairValue;
   

}