masautt

var longestPalindrome = function(s) {
    if (isPalindrome(s)) {
        return s;
    }
    
    var maxP = s[0];
    
    for (var i=0; i < s.length; i++) {
        var curr = s[i];
        for (var j= i + 1; j < s.length; j++) {

masautt

// Using Sets
function removeDupes(arr) {
  return [...new Set(arr)];
}

// Using filter( )
function removeDupes1(arr) {
  return arr.filter((v,i) => arr.indexOf(v) === i)
}

masautt

console.log(["M", "A", "R", "E", "K"].includes("R")); // --> true

console.log(["M", "A", "R", "E", "K"].includes("S")); // --> false

masautt

function hasDuplicates(array) {
    return (new Set(array)).size !== array.length;
}

console.log(hasDuplicates(["M", "A", "S", "A", "U", "T", "T"])); // --> true
console.log(hasDuplicates(["M", "A", "R", "E", "K"])); // --> false

// https://stackoverflow.com/questions/7376598/in-javascript-how-do-i-check-if-an-array-has-duplicate-values

masautt

function largestVal(arr) {
  return Math.max(...arr)
}

console.log(largestVal([1,9,5,4,11,3,3,4,2,])); // --> 11

// https://www.jstips.co/en/javascript/calculate-the-max-min-value-from-an-array/

masautt

function smallestVal(arr) {
  return Math.min(...arr)
}

console.log(smallestVal([1,9,5,4,11,3,3,4,2,])); // --> 1

// https://www.jstips.co/en/javascript/calculate-the-max-min-value-from-an-array/

masautt

function findIntersection(arr1, arr2) {
  return arr1.filter(value => arr2.includes(value))
}

console.log(findIntersection(["M","A", "R", "E", "K"], ["M","A", "S", "A", "T", "T"])) // --> [ 'M', 'A' ]

// https://stackoverflow.com/questions/1885557/simplest-code-for-array-intersection-in-javascript

masautt

function removeOdds(arr){
  return arr.filter(function (num) {
    return num % 2 === 0;
  });
}

console.log(removeOdds([8,6,7,5,3,0,9])); // --> [ 8, 6, 0 ]

// https://stackoverflow.com/questions/18305431/how-to-remove-all-odd-numbers-in-an-array-using-javascript

masautt

function removeEvens(arr){
  return arr.filter(function (num) {
    return num % 2 !== 0;
  });
}

console.log(removeEvens([8,6,7,5,3,0,9])); // --> [ 7, 5, 3, 9 ]

// https://stackoverflow.com/questions/18305431/how-to-remove-all-odd-numbers-in-an-array-using-javascript

masautt

function firstDupe(arr) {
  return arr.findIndex((item, index) => arr.lastIndexOf(item) !== index)
}

console.log( firstDupe([8,6,7,5,3,0,9])); // --> -1 = !exist

console.log( firstDupe(["L", "E", "T", "T", "E", "R"])); // --> 1 = E

// https://stackoverflow.com/questions/39346182/javascript-how-to-find-first-duplicate-value-and-return-its-index