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

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

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
const object_to_pairs = obj => Object.keys(obj).map(k => [k, obj[k]]);
console.log(object_to_pairs({ a: 1, b: 2 }));
console.log(object_to_pairs({ a: 1, b: 2, c: 3 }));

Sample Output:

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

Pictorial Presentation:

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

Flowchart:

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

Live Demo:

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


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Next: Write a JavaScript program to create an object from the given key-value pairs.

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JavaScript: Tips of the Day

Returns an array of n-tuples of consecutive elements

Example:

const tips_arr = (n, arr) =>  n > arr.length ? [] : arr.slice(n - 1).map((v, i) =>[...arr.slice(i, i + n - 1), v]);
console.log(tips_arr(2, [1, 2, 3, 4, 5])); 
console.log(tips_arr(3, [1, 2, 3, 4, 5]));
console.log(tips_arr(5, [1, 2, 3, 4]));

Output:

[[1, 2], [2, 3], [3, 4], [4, 5]]
[[1, 2, 3], [2, 3, 4], [3, 4, 5]]
[]