Default Function Parameters

Provide a default value to a function parameter.

// LONG FORM
function pickUp(fruit) {
  if(fruit === undefined){
    console.log("I picked up a Banana");
  } else {
    console.log(`I picked up a ${fruit}`);
  }
}

// SHORTHAND
function pickUp(fruit = "Banana") {
  console.log(`I picked up a ${fruit}`)
}

pickUp("Mango"); // -> I picked up a Mango
pickUp();        // -> I picked up a Banana

Source

https://medium.com/geekculture/20-javascript-snippets-to-code-like-a-pro-86f5fda5598e