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How to convert Set to String space separated in javascript


Convert Set to String in javascript

There are many ways to convert Set to String with a space separator in javascript.

Set is a data structure introduced in the latest javascript(ES6). It is used to store unique elements.

Next, Declare a set variable and add the data to it.

var set = new Set();
set.add('first');
set.add('second');
set.add('three');

As you see above, Set stores multiple strings.

It is not straightforward, to convert Set to String.

Set has toString() method which prints [Object Set]

console.log(set); //:[object Set]
console.log(set.toString()); //[object Set]

This is not what we are expecting. Instead, We want values from the set in the form of a single string like one two three

How to convert Set to String with spaces in javascript

Multiple ways we can convert Set to String with spaces

Array.from with join function

First, convert Set into Array usingArray.from()` function

Array.from() method accepts a set or any iterated array of objects and returns an array.

Next, Iterate results in an array of elements and uses the join function, and returns a string with spaces.

let result=Array.from(set).join(' ');
console.log('== ',result); // one two three

also, you can use [spread operator syntax] (/2018/08/es6-spread-operator-in-javascript.html) can be replaced with Array.from() as seen below

let result=[...set].join(' ');
console.log(result); // one two three

using for of loops

First, Iterate each element of S using for of loop add each element to the result array finally, using join function, return a string

let result = [];
for(let str of set){
  result.push(str);
}
console.log([...result].join(' '));

You can also check different ways to iterate enumerated objects in javascript to iterate each element in a set.

using foreach loop foreach loop is another way to iterate a set. Here is an example of foreach set iteration.

let result='';
set.forEach(value => result =result+" "+ value);
console.log(result);

How to convert set to string comma separated

As discussed above, First, convert the set to an array using Array.from() function next, using a join with comma returns string with comma separated string

let result='';
 result=Array.from(set).join(',');
console.log(result); // one,two,three

Conclusion

To Sum up, we can iterate each element in a set of many ways and convert it to an array and write a logic to get desired output.

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