Javascript, Array to string format

Question

I am in a situation in my Ionic project to convert array to string format(array). Here is the example

var fruits = ["Banana", "Orange", "Apple", "Mango"];

should be converted to

var strFruits = "['Banana', 'Orange', 'Apple', 'Mango']";

I can do it using loop and string operation, but there should be an easy way to resolve this.

• yBrodsky: JSON.stringify maybe?
• ricardoorellana: Yeah, why not JSON.stringify(fruits)?

Answer 1

Try:

const fruits = ['Banana', 'Apple', 'Orange'];
const format = "['" + fruits.join("', '") + "']";
console.log(format);
// => ['Banana', 'Apple', 'Orange']

Or as suggested in the comments, using JSON.stringify:

const fruits = ['Banana', 'Apple', 'Orange'];
const format = JSON.stringify(fruits);
console.log(format);
// => ["Banana", "Apple", "Orange"]

I personally do not prefer the last one, because you are forced to use double quotes, and the only way to change that is using RegEx.

• Sebastian Simon: "you are forced to use double quotes" — which would even make it valid JSON. Why would that ever be undesirable? Why would single quotes ever be preferrable to double quotes?
• kwyntes: If your code style prefers to use single quotes, it's inconsistent to use double quotes

Answer 2

You can use either use JSON.stringify(fruits) or Just concat "["+fruits.toString()+"]"

Answer 3

For

const fruits = ["Banana", "Orange", "Apple", "Mango"];

You could do:

console.log(JSON.stringify(fruits));
// ["Banana","Orange","Apple","Mango"]

This returns a string that can be parsed back to JS using JSON.parse() which seems to be exactly what you need

To the scope of your question, this would be valid too:

console.log(`['${fruits.join("', '")}']`);
// ['Banana', 'Orange', 'Apple', 'Mango']

This would return what you asked for with the single quotes, but using JSON.stringify() has the added advantage that the resulting string can always be parsed back (I'ts always valid JSON)

JSON.parse(`['${fruits.join("', '")}']`);
// Uncaught SyntaxError: Unexpected token ' in JSON at position 1

Answer 4

console.log(JSON.stringify(["Banana", "Orange", "Apple", "Mango"]).replace(/"/g, "'"))

But i think first variant with method "join()" more suitable for this case, because replace() will work with wrong way, if text will contain double quotes.