# 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:

Flowchart:

Live Demo:

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

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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]]
[]
```