Introduction
Default parameter values are a great way to make your JavaScript functions more flexible and easier to use. By setting a default value for a parameter, you can make sure that the function will always have a value to work with, even if the user doesn’t provide one. In this article, we’ll look at how to set a default parameter value for a JavaScript function.
Using the Default Parameter Syntax
The syntax for setting a default parameter value is fairly straightforward. All you need to do is assign a value to the parameter in the function definition. For example, if we wanted to set a default value for the parameter
xin the following function:
function myFunction(x) {
// do something with x}We could do so by adding a default value to the parameter like this:
function myFunction(x = 10) {
// do something with x}Now, if the user doesn’t provide a value for
x, the function will use the default value of
10. This is a great way to make sure that the function always has a value to work with, even if the user doesn’t provide one.
Using the ES6 Syntax
If you’re using the ES6 syntax, you can also use the
=operator to set a default parameter value. For example, if we wanted to set a default value for the parameter
xin the following function:
const myFunction = (x) => {
// do something with x}We could do so by adding a default value to the parameter like this:
const myFunction = (x = 10) => {
// do something with x}Now, if the user doesn’t provide a value for
x, the function will use the default value of
10. This is a great way to make sure that the function always has a value to work with, even if the user doesn’t provide one.
Summary
In this article, we looked at how to set a default parameter value for a JavaScript function. By setting a default value for a parameter, you can make sure that the function will always have a value to work with, even if the user doesn’t provide one. We looked at how to use the default parameter syntax and the ES6 syntax to set a default parameter value.
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