JS examples

Some useful Js Examples:
     If we have an array like 
      Eg:
       const animals = ['Hen', 'elephant', 'llama', 'leopard', 'ostrich', 'Whale', 'octopus', 'rabbit', 'lion',                                            'dog'];           
    And we want to print only the first numbers in the array  follow the code below,
      const secretMessage = animals.map(animal => animal[0]);
       console.log(secretMessage.join(' '));                         
   OUTPUT:
         HELLOWORLD

     If we want to print only first letters of a number  Follow the code below
     EG:     
      const bigNumbers = [100, 200, 300, 400, 500];
      const smallNumbers = bigNumbers.map(num => num/100);
      console.log(smallNumbers);
OUTPUT:
    [1,2,3,4,5]
Take a look at the example array below
  const animals = ['hippo', 'tiger', 'lion', 'seal', 'cheetah', 'monkey', 'salamander', 'elephant']; 
  In this array we want to print the index of the strings which starts with 's' 
     const startsWithS = animals.findIndex(animal => {
  return animal[0] === 's' ? true : false;
    });