CODEWITHSUNDEEP
javascriptphp
Sarat Chandra
Sarat Chandra

Reputation: 9

Converting php code to JavaScript

How can I convert this PHP code to JavaScript code? I am not sure about array() method and => symbol.

Here is the code:

$a = $value;
for ($i = count($keys)-1; $i>=0; $i--) {
  $a = array($keys[$i] => $a);
}

Create nested array by array of keys. This is the question I am looking to get it done in java script. I have been trying so many ways but got no success.

Your help is appreciated.

Upvotes: 1

Views: 191

Answers (1)

ncphillips
ncphillips

Reputation: 736

This question is a little odd because PHP arrays are more like objects in Javascript then actual arrays. The biggest difference is syntactic:

Here is a solution that matches the provided example:

let a = 4
let keys = ["a", "b", "c"]

// Same as the PHP code, loop backwards
for(let i = keys.length - 1; i >= 0; i--) {
  let key = keys[i]

  // Create a new object with the key and the old a as the value.
  a = { [key]: a }
}

A more functional approach would be to use Array#reduce:

let a = 4
let keys = ["a", "b", "c"]

let result = keys
  .reverse()
  .reduce((value, key) => ({ [key]: value }), a)

EDIT

A slightly better approach is to use Array#reduceRight. This will let you just have the final value you in the array:

let keys = ["a", "b", "c", 4]

let result = keys.reduceRight((v, k) => ({ [k]: v }))

Upvotes: 1

Related Questions