🔰accessing elements

JS ⟩ object ⟩ built-in ⟩ Array ⟩ accessing arrays

arr.push(value)    // append element
arr.pop()          // removes and returns last element
arr.unshift(value) // prepend element
arr.shift()        // removes and returns first element

delete a[1]        // delete element

//                             ┌────────┐ <--- elements to add
arr.splice(index, deleteCount, v1, v2, v3)
//           └── start index to delete/insert elements

⭐️ 重點

array elements can be deleted with the delete operator.

🔴 主題

• element index

• element

• array object property

👥 相關

• ✅ element(s) are accessed throught element index using bracket notation [].

• an Array may have its own array object property(s)❗

📗 參考

• JS.info ⟩ iterables

• JavaScript: The Definitive Guide ⟩ 7.5 Adding and Deleting Array Elements

📘 手冊

• Array.prototype.splice() - insert/delete elements.