Omitting false values while constructing string in JavaScript

We have an array that contains some string values as well as some false values.

We are required to write a JavaScript function that takes in this array and returns a string constructed by joining values of the array and omitting false values.

Example

The code for this will be −

const arr = ["Here", "is", null, "an", undefined, "example", 0, "", "of", "a", null, "sentence"];
const joinArray = arr => {
   const sentence = arr.reduce((acc, val) => {
      return acc + (val || "");
   }, "");
   return sentence;
};
console.log(joinArray(arr));

Output

The output in the console −

Hereisanexampleofasentence