forEach()

• Executes a provided function once for each array element.

• Example:

  let fruits = ['Apple', 'Banana', 'Mango'];
  fruits.forEach(function(item, index) {
    console.log(index, item);
  });
  // Output: 0 Apple, 1 Banana, 2 Mango
  
  

map()

• Creates a new array populated with the results of calling a provided function on every element.

• Example:

  let numbers = [1, 2, 3, 4, 5];
  let doubled = numbers.map(function(number) {
    return number * 2;
  });
  console.log(doubled); // Output: [2, 4, 6, 8, 10]
  
  

filter()

• Creates a new array with all elements that pass the test implemented by the provided function.

• Example:

  let numbers = [1, 2, 3, 4, 5];
  let even = numbers.filter(function(number) {
    return number % 2 === 0;
  });
  console.log(even); // Output: [2, 4]
  
  

reduce()

• Executes a reducer function on each element of the array, resulting in a single output value.

• Example:

  let numbers = [1, 2, 3, 4, 5];
  let sum = numbers.reduce(function(total, number) {
    return total + number;
  }, 0);
  console.log(sum); // Output: 15
  
  

flatMap()

• Maps each element using a mapping function, then flattens the result into a new array.

• Example:

  let numbers = [1, 2, 3, 4];
  let mapped = numbers.flatMap(x => [x * 2]);
  console.log(mapped); // Output: [2, 4, 6, 8]