array containing 0…9

Question

// I have 2 set of codes, both can generate array containing 0-9
var N = 10;
var arr1 = Object.keys(Array(N).fill()); // generate array containing 0-9
console.log(JSON.stringify(arr1));

var arr2 = Array.from(Array(N).keys());// generate array containing 0-9
console.log(JSON.stringify(arr1));

if(JSON.stringify(arr1) === JSON.stringify(arr2)) console.log('JSON.stringify(arr1) === JSON.stringify(arr2)');
else console.log('JSON.stringify(arr1) !== JSON.stringify(arr2)');

console.log('When their output are compared, why there are not the same?');

https://code.sololearn.com/WhmWwGp4Ng6o/#js

Answer 1

I dunno, but it seems keys returnd a string, fill returns numbers

Answer 2

Thanks, though my answer is pure inference as I have no knowledge on JSON

Answer 3

object.keys returns an array of strings
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys

Answer 4

@Pegasus @A_Hook
Ohh there are string and number different. Thank you for the answer. it's really helpful.

Answer 5

@Pegasus JSON->Java Script Object Notation🙂