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ES6 Required Parameters

aidanlincoln profile image AidanLincoln ・1 min read

Have you ever made a function that should require parameters to be passed in? Probably. In ES6 you can use default parameters to achieve this goal.

First you can make a function that returns an error message. This error function can be used as a default parameter in any function you make.
Now if you call the function you made without providing the necessary parameters, an error will be thrown.


function error() {
throw new Error("Missing parameter");
function test(parameter = error()) {
return parameter;

test() // "Missing parameter"
test("hi") // "hi"

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