Underdoge

function extractEachKth(inputArray, k) {
    return inputArray.filter((curr,index)=>{
       if((index+1)%k!=0)
           return curr;
    });
}

Underdoge

function isNext(string1,string2){
    var diff=0;
    for(var i=0;i<string1.length;i++){
        if(string1[i]!=string2[i])
            diff++;
    }
    if (diff!=1)
        return false;
    else
        return true;

Underdoge

function absoluteValuesSumMinimization(a) {
    var x=a[0],temp=a.reduce((acc,curr)=>{
           return acc+Math.abs(curr-x); 
    },0);
    for(var i=1;i<a.length;i++){
        if(a.reduce((acc,curr)=>{return acc+Math.abs(curr-a[i]);},0)<temp){
            temp=a.reduce((acc,curr)=>{return acc+Math.abs(curr-a[i]);},0);
            x=a[i];
        }
    }

Underdoge

function depositProfit(deposit, rate, threshold) {
    var years=0;
    while(deposit<threshold){
        deposit+=deposit*(rate/100);
        years++;
    }
    return years;
}

Underdoge

function circleOfNumbers(n, firstNumber) {
    return (firstNumber*2==n)?0:(firstNumber<(n/2))?firstNumber+(n/2):firstNumber-(n/2);
}

Underdoge

function chessBoardCellColor(cell1, cell2) {
    if((cell1.charCodeAt(0)-64)%2==0&&(cell2.charCodeAt(0)-64)%2==0)
        if((cell1.charCodeAt(1)%2!=0&&cell2.charCodeAt(1)%2!=0)||(cell1.charCodeAt(1)%2==0&&cell2.charCodeAt(1)%2==0))
            return true;
        else
            return false;
    else
    if((cell1.charCodeAt(0)-64)%2!=0&&(cell2.charCodeAt(0)-64)%2!=0)
        if((cell1.charCodeAt(1)%2==0&&cell2.charCodeAt(1)%2==0)||(cell1.charCodeAt(1)%2!=0&&cell2.charCodeAt(1)%2!=0))
            return true;

Underdoge

function alphabeticShift(inputString) {
    var shift=inputString.split("");
    var shifted=shift.map((curr)=>{
        if (curr=='z')
            return 'a';
        else
            return String.fromCharCode(curr.charCodeAt(0)+1);
    })
    return shifted.join("");
}

Underdoge

function variableName(name) {
    return /^([a-z]|[A-Z]|_)([a-z]|[A-Z]|_|\d)*$/.test(name);
}

Underdoge

function evenDigitsOnly(n) {
    var nums=n.toString().split("");
    return nums.reduce((acc,currval,currindex,arr)=>{
        return acc&&currval%2==0
    },true);
}

Underdoge

function arrayReplace(inputArray, elemToReplace, substitutionElem) {
    return inputArray.map((curr)=>{
        if(curr==elemToReplace)
            return substitutionElem;
        else
            return curr;
    });
}