JavaScript Arrays

• Ordered Collection: An array is an ordered collection of values (elements). These values can be of any data type, including numbers, strings, objects, and even other arrays.

• Indexing: Each element in an array has an index, which is its position within the array. The index starts from 0 (the first element).

• Creating Arrays:

  • const myArray = [1, 2, 3, "hello", true];
  • const emptyArray = [];

• Accessing Elements:

  • myArray[0] // Accesses the first element (1)
  • myArray[myArray.length - 1] // Accesses the last element

• Array Methods:

  • push(): Adds elements to the end of the array.
  • pop(): Removes the last element from the array.
  • shift(): Removes the first element from the array.
  • unshift(): Adds elements to the beginning of the array. 
     
  • slice(): Creates a shallow copy of a portion of the array.
  • splice(): Adds/removes elements from an array at a specific position.
  • join(): Converts the elements of an array into a string.
  • concat(): Creates a new array by concatenating existing arrays.
  • forEach(), map(), filter(), reduce(): Higher-order functions for iterating and manipulating arrays.