JAVASCRIPT

javasript array indexof

var array = [2, 9, 9];
array.indexOf(2);     // 0
array.indexOf(7);     // -1
array.indexOf(9, 2);  // 2
array.indexOf(2, -1); // -1
array.indexOf(2, -3); // 0

js Arrays indexOf

function quickCheck(arr, elem) {
  if (arr.indexOf(elem) >= 0) {
    return true;
  }
  return false;
}
console.log(quickCheck(["squash", "onions", "shallots"], "mushrooms"));

JavaScript Array Methods indexOf()

let days = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday'];
console.log(days.indexOf('Sunday'));
// --> -1, mert nem található meg

let days = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday'];
console.log(days.indexOf('Monday'));
// --> 0

js Arrays indexOf

function quickCheck(arr, elem) {
  return arr.indexOf(elem) >= 0 ? true : false;
}
console.log(quickCheck(["squash", "onions", "shallots"], "mushrooms"));

JavaScript Array indexOf()

const fruits = ["Apple", "Orange", "Apple", "Mango"];
let position = fruits.indexOf("Apple") + 1;

js Arrays indexOf

function quickCheck(arr, elem) {
  return arr.indexOf(elem) != -1;
}
console.log(quickCheck(["squash", "onions", "shallots"], "mushrooms"));

Array indexof

arr.indexOf("jay")

Array of indexOf

const arr = ["apples", "pears", "plums", "oranges"];
console.log(arr.indexOf("pears"));

Array indexof

arr.indexOf("jay")