indexOf()

• Returns the first index at which a given element can be found.

• Example:

  let fruits = ['Apple', 'Banana', 'Mango'];
  let index = fruits.indexOf('Banana');
  console.log(index); // Output: 1
  
  

find()

• Returns the value of the first element that satisfies the provided testing function.

• Example:

  let numbers = [1, 2, 3, 4, 5];
  let found = numbers.find(function(number) {
    return number > 3;
  });
  console.log(found); // Output: 4
  
  

findIndex()

• Returns the index of the first element that satisfies the provided testing function.

• Example:

  let numbers = [1, 2, 3, 4, 5];
  let index = numbers.findIndex(function(number) {
    return number > 3;
  });
  console.log(index); // Output: 3
  
  

includes()

• Determines whether an array includes a certain value.

• Example:

  let fruits = ['Apple', 'Banana', 'Mango'];
  let hasBanana = fruits.includes('Banana');
  console.log(hasBanana); // Output: true