Tech Kraft

Remove all elements from the initial array that are of the same value as the arguments:

function destroyer(arr) {
 for(var j=1; j<arguments.length; j++){
 arr = arr.filter(checkVal, arguments[j]);
 } 
 return arr;
}

function checkVal(value){
 return (value != this);
}

function largestOfFour(arr) {
 var resultArr=[];
 
 for(var i=0; i<arr.length;i++){
 var maxInt=0;
 
 for(var j=0; j<arr[i].length; j++){
 maxInt = Math.max(maxInt, arr[i][j]);
 }
 
 resultArr[i] = maxInt;
 }
 
 return resultArr;
}

Find Index to Insert an Item in an Array:

function getIndexToIns(arr, num) {
 arr = arr.sort(function(a,b){
 return a>b;
 });
 
 var i=0;
 
 while(i<arr.length && arr[i]<num){
 i++;
 }
 
 return i;
}

Find all items that exist in either one of two arrays:

function diffArray(arr1, arr2) {
 var newArr = [];
 var newArr2 = [];

newArr = arr1.filter(function(elem, index, array) {
 for(var i=0; i<arr2.length; i++){
 if(elem==arr2[i]) return false;
 }
 return true;
 });

newArr2 = arr2.filter(function(elem, index, array) {
 for(var i=0; i<arr1.length; i++){
 if(elem==arr1[i]) return false;
 }
 return true;
 });
 
 return newArr.concat(newArr2);
}