I have following array like below
[1,null,null,2]
I want to implode make it as string like below
1,null,null,2
I tried
temparr.join(',')
But I am getting
1,,,2
How do i preserve the keyword null.
4 Answers
You could convert the values to string in advance, because undefined or null values are empty string by converting with join.
If an element is
undefined,nullor an empty array[], it is converted to an empty string.
const array = [1, null, null, 2];
console.log(array.map(String).join(','));
Comments
Map to a string first:
[1,null,null,2].map(String).join(",");
Comments
You can't make join do that, so you would have to change the input given to join in the first place. For example:
const result = [1, null, null, 2].map(value => value === null ? "null" : value).join(",");
console.log(result);
Comments
Just replace the value null by the string 'null' :
console.log([1,null,null,2].map(x => x ?? 'null').join(','))
Comments
nullfirst? Or by writing your own join function, that takes your special requirement into account.