Category: Objects Kind: Operation Description: Pick items from an object

Inputs

Outputs

About key-value pairs

A key-value pair is a fundamental concept in programming and data storage, especially in dictionaries, maps, JSON, and databases.

Basic Idea:

A key-value pair consists of:

• Key: A unique identifier.
• Value: The data or information associated with that key.

Example in Real Life:

Think of a dictionary (the book):

• The word is the key.
• The definition is the value.

If you look up the key "apple" in the dictionary, the value might be "a fruit that grows on trees".

Example

Take, for example, a real estate listing. It might be stored like this:

property_listing = {
"address": "123 Maple Street",
"price": 450000,
"bedrooms": 3,
"bathrooms": 2,
"square_feet": 1800,
"status": "For Sale"
}

Breakdown of key-value pairs:

Each key describes a property attribute, and each value holds the actual data about it.

This kind of structure is super common in databases, and APIs—makes it easy to store, access, and filter lists.

Object entries refer to the key-value pairs within an object. In JavaScript (and similar structures like JSON), these are called entries because each one is a single unit of information: a key and its corresponding value.

Let’s say you have a JavaScript object:

javascript
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const property = {
  address: "123 Maple Street",
  price: 450000,
  bedrooms: 3
};

The entries of this object are:

• ["address", "123 Maple Street"]
• ["price", 450000]
• ["bedrooms", 3]

How-to

1. Feed in an object

   This can be from construct object or any node that results in an object

   Use map to process Lists of objects

2. Feed in a key or a list of keys.

3. The result is the object entries for those keys