masautt

let start = new Date();

setTimeout(()=> {
  console.log((new Date() - start) / 1000 + " seconds have passed"); // --> 5 seconds have passed
},5000);

masautt

function shuffleArray(arr) {
    for (let i = arr.length - 1; i > 0; i--) {
        const j = Math.floor(Math.random() * (i + 1));
        [arr[i], arr[j]] = [arr[j], arr[i]];
    }
    return arr;
}

let arr = [8,6,7,5,3,0,9];

masautt

let arr = ["M", "A", "S", "A", "U", "T", "T"]

//Remove the last element
arr.pop(); // returns "T"

console.log(arr) // --> [ 'M', A', 'S', 'A', 'U', 'T' ]

masautt

let arr = ["M", "A", "S", "A", "U", "T", "T"]

//Remove the first element
arr.shift(); // returns "M"

console.log(arr) // --> [ 'A', 'S', 'A', 'U', 'T', 'T' ]

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

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 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 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 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 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/