Node.js join() function

join() is an array function from Node.js that is used to return a string from the array. 

Syntax:

array_name.join(parameter)

Parameter: This function takes a single parameter as per which the join operation has to be performed. 

Return type: The function returns the string. 

The program below demonstrates the working of the function: 

Example 1:

javascript

function joinDemo() {
    const str = arr.join("*");
    console.log(str);
}
const arr = [17, 55, 87, 49, 78];
joinDemo();

Output:

17*55*87*49*78

Example 2:

javascript

function joinDemo() {
    const str = arr.join("");
    const str1 = arr.join("$");
    console.log(str);
    console.log(str1);
}
const arr = ['C', 'Java', 'Python'];
joinDemo();

Output:

CJavaPython
C$Java$Python