JAVASCRIPT

fat arrow function

// Traditional Anonymous Function
(function (a) {
  return a + 100;
});

// Arrow Function Break Down

// 1. Remove the word "function" and place arrow between the argument and opening body bracket
(a) => {
  return a + 100;
};

// 2. Remove the body braces and word "return" — the return is implied.
(a) => a + 100;

// 3. Remove the argument parentheses
a => a + 100;

// Arrow Function
(a, b) => {
  const chuck = 42;
  return a + b + chuck;
};


//Function use with Map function
const materials = [
  'Hydrogen',
  'Helium',
  'Lithium',
  'Beryllium'
];

console.log(materials.map(material => material.length));
// expected output: Array [8, 6, 7, 9]