js katas

src/arrays.js

@@ -1,62 +1,141 @@
+//const array=["cat","dog","elephant","fox"];
 const getNthElement = (index, array) => {
+  if (index>0 && index<=array.length-1){
+    return array[index];
+  }
+  if(index>array.length-1){
+      return array[index-4];
+    }
+  if(index===0){
+    return array[0];
+  }
+    };
+
   // your code here
-};
 
+
 const arrayToCSVString = array => {
-  // your code here
+
+  let n =[array];
+  return n.toString();
 };
 
+
 const csvStringToArray = string => {
+  return string.split(",");
   // your code here
 };
 
+//const array = [];
+//const array2 = [1, 2, 3];
 const addToArray = (element, array) => {
+   array.push(element);
+
+
   // your code here
 };
 
+const array = ['a', 'b', 'c'];
+const array2 = [1, 2, 3];
 const addToArray2 = (element, array) => {
+  let newArray=array.concat(element);
+  return newArray;
   // your code here
 };
 
 const removeNthElement = (index, array) => {
+  return array.splice(index,1);
   // your code here
 };
 
 const numbersToStrings = numbers => {
+  const m=numbers.toString();
+  return m.split(',');
   // your code here
 };
 
 const uppercaseWordsInArray = strings => {
+  const newString=strings.map((str) =>str.toUpperCase())
+  return newString;
   // your code here
 };
 
 const reverseWordsInArray = strings => {
-  // your code here
-};
+  return strings.map(string => string.split('').reverse().join(''));
+}
+
+
 
 const onlyEven = numbers => {
-  // your code here
-};
+  let Array5=numbers.filter(number => number%2===0);
+  return Array5;
 
-const removeNthElement2 = (index, array) => {
-  // your code here
 };
 
+
+const removeNthElement2 = (index,array) => {
+  return array.filter((element)=>{
+    if (element!==array[index]){
+      return element
+    }
+  })
+}
+
+
 const elementsStartingWithAVowel = strings => {
-  // your code here
-};
+  return strings.filter((string)=>{
+    if(string.charAt(0)==="a"||string.charAt(0)==="e"||string.charAt(0)==="i"||string.charAt(0)==="o"||string.charAt(0)==="u"||string.charAt(0)==="A"||string.charAt(0)==="E"||string.charAt(0)==="I"||string.charAt(0)==="O"||string.charAt(0)==="U"){
+      return string
+    }
+  })
+
+  }
+
+
+
+
+
+
 
 const removeSpaces = string => {
-  // your code here
+  const stringArray=string.split(" ");
+  const namesCombined=stringArray.reduce((acc,curr)=>{
+    return acc+curr
+  })
+  return namesCombined;
 };
 
 const sumNumbers = numbers => {
-  // your code here
+  const sumNumbers=numbers.reduce((acc,curr)=>{
+    return acc+curr;
+  })
+  return sumNumbers;
 };
 
 const sortByLastLetter = strings => {
-  // your code here
-};
+  return strings.sort((a, b) =>
+    (a.charCodeAt(a.length - 1) - b.charCodeAt(b.length - 1))
+  )}
+
+
+
+  //const stringy= strings.map((string)=>{
+    //return string.split("").reverse().join("")
+  //}) 
+  //const newS=stringy.sort();
+    //return newS.split("").reverse().join("")
+
+
+
+
+//
+
+
+
+
+
+
+
 
 module.exports = {
   getNthElement,

src/booleans.js

@@ -1,60 +1,141 @@
 function negate(a) {
+  return !a;
   // your code here
 };
 
 function both(a, b) {
+  if (a===true && b===true){
+    return true;
+  }else{
+    return false;
+  }
   // your code here
-};
+}
 
 function either(a, b) {
+  if (a===true || b===true){
+    return true 
+  }else{ 
+    return false;
+    }
+  };
   // your code here
-};
+
 
 function none(a, b) {
+  if (a===true || b===true){
+    return false
+  }else{
+    return true;
+  }
   // your code here
 };
 
 function one(a, b) {
-  // your code here
-};
+  if(a===true && b===true){
+    return false;
+  }else if (a===true || b===true){
+  return true;
+  }else{
+      return false;
+    }
+  };
+
+
 
 function truthiness(a) {
+  return Boolean(a);
+  }
+
+
   // your code here
-};
+
 
 function isEqual(a, b) {
+  if(a===b){
+    return true;
+  }else{
+    return false;
+  }
   // your code here
 };
 
 function isGreaterThan(a, b) {
+  if(a>b){
+    return true;
+  }else{
+    return false;
+  }
   // your code here
 };
 
 function isLessThanOrEqualTo(a, b) {
+  if (a<=b){
+    return true;
+  }else{
+    return false;
+  }
   // your code here
 };
 
 function isOdd(a) {
-  // your code here
+  if(a%2!==0){
+    return true;
+  }else{
+    return false;
+  }
+
 };
 
 function isEven(a) {
+  if(a%2===0){
+    return true;
+  }else{
+    return false;
+  }
+
   // your code here
 };
 
 function isSquare(a) {
+  if (Number.isInteger(Math.sqrt(a))){
+    return true;
+  }else{
+    return false;
+  }
   // your code here
 };
 
 function startsWith(char, string) {
+  if(string.startsWith(char)){
+    return true;
+  }else {
+    return false;
+  }
   // your code here
 };
 
 function containsVowels(string) {
-  // your code here
-};
+
+    const vowels = ["a" ,"e" ,"i", "o","u","A","B","C","D","E"];
+    let result=false;
+    for(let i=0;i<string.length;i++)
+    if(vowels.includes(string[i])){
+      result=true;
+    }
+    return result;
+  }
+
+
+
+
 
 function isLowerCase(string) {
+  if(string===string.toLowerCase()){
+    return true;
+  }else{
+    return false;
+  }
   // your code here
 };
 

src/numbers.js

@@ -1,44 +1,55 @@
 function add (a, b) {
+  return a+b;
   // your code here
 }
 
 function subtract (a, b) {
+  return a-b;
   // your code here
 }
 
 function multiply (a, b) {
+  return a*b;
   // your code here
 }
 
 function divide (a, b) {
+  return a/b;
   // your code here
 }
 
 function power (a, b) {
+  return a**b;
   // your code here
 }
 
 function round (a) {
+  return Math.round(a);
   // your code here
 }
 
 function roundUp (a) {
+  return Math.ceil(a);
   // your code here
 }
 
 function roundDown (a) {
+  return Math.floor(a);
   // your code here
 }
 
 function absolute (a) {
+  return Math.abs(a);
   // your code here
 }
 
 function quotient (a, b) {
+  return Math.trunc(a/b);
   // your code here
 }
 
 function remainder (a, b) {
+  return a%b;
   // your code here
 }