JavaScript: Create an array of key-value pair arrays from a given object

JavaScript fundamental (ES6 Syntax): Exercise-40 with Solution

Create Key-Value Pair Array from Object

Write a JavaScript program to create an array of key-value pair arrays from a given object.

• Use Object.entries() to get an array of key-value pair arrays from the given object.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2
// Define a function 'object_to_pairs' that takes an object 'obj' as input.
const object_to_pairs = obj =>
  // Map over the keys of the object and return an array of key-value pairs.
  Object.keys(obj).map(k => [k, obj[k]]);

// Test the 'object_to_pairs' function with different objects and output the resulting arrays of key-value pairs.
console.log(object_to_pairs({ a: 1, b: 2 })); // Output: [['a', 1], ['b', 2]]
console.log(object_to_pairs({ a: 1, b: 2, c: 3 })); // Output: [['a', 1], ['b', 2], ['c', 3]]

Output:

[["a",1],["b",2]]
[["a",1],["b",2],["c",3]]

Visual Presentation:

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-1-40 by w3resource (@w3resource) on CodePen.

For more Practice: Solve these Related Problems:

• Write a JavaScript program that converts an object’s properties into an array of [key, value] pairs.
• Write a JavaScript function that maps an object’s own properties to an array of key-value arrays using Object.entries().
• Write a JavaScript program that filters an object’s keys and creates an array of key-value pairs only for specified keys.

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