javascript array within array toString()

Question

I have one array like this:

temp = [
'data1',
['data1_a','data1_b'],
['data2_a','data2_b','data2_c']
];
//

I want to change the array within my array using toString(), how the best to do it? Then the array like :

temp = [
'data1',
'data1_a,data1_b',
'data2_a,data2_b,data2_c
];

Answer 1

use map and get that desired output. No need for any other complex methods or functions,

var temp = [
 'data1',
 ['data1_a','data1_b'],
 ['data2_a','data2_b','data2_c']
];
var res = temp.map((item) => item.toString());
console.log(res);

Answer 2

Just map it and return the stringified version. There's no need for any checks - the strings will just be unmodified, the arrays will be converted like you want them

temp = [
 'data1', ['data1_a', 'data1_b'],
 ['data2_a', 'data2_b', 'data2_c']
];
let foo = temp.map(String);
console.log(foo);

• ikwijaya: but if i provide NULL in array, this NULL will be 'null', how to give this empty??

Answer 3

You can use .map() with .join():

let temp = [
 'data1',
 ['data1_a','data1_b'],
 ['data2_a','data2_b','data2_c']
];
let result = temp.map(v => Array.isArray(v) ? v.join(",") : v);
console.log(result);

Docs:

• Array.prototype.map()
• Array.prototype.join()
• Array.isArray()

Answer 4

Use this

temp = [
'data1',
['data1_a','data1_b'],
['data2_a','data2_b','data2_c']
];
for(var i = 0; i < temp.length; i ++) {
 temp[i] += "";
}
console.log(temp);