Category: Objects Kind: Operation Description: Construct a key-value pair

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 a string to define the key or name of the property

   You can use a string, panel, or the result of any other node that outputs a string

2. Feed in any data type as the “value”

   You could use string, number, Boolean, or any single value

3. The result is a key-value pair object

1. To create multiple key-value pairs from lists, use map