What is the output of the below given JavaScript code snippet? var a = new Array(); a["name"] = "Rihana"; a["place"] = "Hyderabad"; (a) Options: 1. [name: 'Rihana', place: 'Hyderabad'] 2. ["Rihana", "Hyderabad"] 3. Array does not support string indexing 4. {name:["Aravind"], place:["Chidambaram"]}
Answer (1)
In JavaScript, when you use an array and assign values using string keys, it behaves more like an object rather than a traditional array where elements are accessed with numerical indices.
Here's the step-by-step explanation:
Array Declaration: var a = new Array(); creates an empty array.
String Indexing:
- a["name"] = "Rihana"; assigns "Rihana" to the key "name". - a["place"] = "Hyderabad"; assigns "Hyderabad" to the key "place".
Array vs Object: Even though a is declared as an array, using string keys converts it to an associative array, which is equivalent to an object in JavaScript.
Output: Using string keys doesn't store values in the array part of a. Instead, it adds properties to a like an object.
Therefore, using console.log(a) would display an empty array [], as numerical indices have not been used. However, accessing a.name or a["name"] gives "Rihana", and a.place or a["place"] gives "Hyderabad".
Considering the options given:
[name: 'Rihana', place: 'Hyderabad'] - This format suggests object notation, but arrays with string indices act like objects without displaying this format.
["Rihana", "Hyderabad"] - This suggests a typical array display, which isn't applicable here because we aren't using numeric indices.
Array does not support string indexing - Closest to reality since arrays are not designed for string indexing, but allow it by behaving like objects.
{name:["Aravind"], place:["Chidambaram"]} - Is unrelated to the operations in the code.
Right Choice: Option 3. Array does not support string indexing. While arrays can technically handle such operations by treating them as objects, they are not indexed in the typical array manner.
