𝗠𝗮𝘀𝘁𝗲𝗿𝗶𝗻𝗴 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗔𝗿𝗿𝗮𝘆𝘀

JavaScript arrays store lists of values in order. You access each value through an index.

Key facts about arrays:

• They are objects, not primitives. • They resize automatically. • They hold different data types at once. • Use typed arrays if you need strict data types.

How to use them:

You declare an array like this: let fruits = ["Apple", "Orange", "Plum"];

You access the first item like this: alert(fruits[0]);

Rules to remember:

  • Arrays use zero-based indexing. The first item sits at index 0. The last item sits at the length minus 1.
  • You cannot use strings as indexes. You must use non-negative integers.
  • Copying an array creates a shallow copy. This means nested objects stay linked to the original array.

Source: https://dev.to/karthick_07/mastering-javascript-arrays-techniques-and-best-practices-287e