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Hello everyone! Today we will continue with a new situation. It’s “Expected to return a value at the end of arrow function consistent-return“. As you know, in javascripts there are many functions. It is not easy to use them properly. However, there are functions that, if you know them, will be very helpful to you in coding such as saving time with better results. Let’s find out in this article!
When Does The Error “Expected to return a value at the end of arrow function consistent-return” Occur?
If you have an arrow function with an error as the title. How can you refactor it to fix the problem?
Expected to return a value at the end of arrow function consistent-return
Here is your program:
// Disable default form submission when user hits enter.
const $facetInput = $('.facet-input');
const $submitButton = $('.facet-submit');
$facetInput.on('keydown', (event) => {
if ((event.key === 'enter' || event.keyCode === 13) && event.target !== $submitButton) {
event.preventDefault();
return false;
}
});
Solutions For The Error “Expected to return a value at the end of arrow function consistent-return“
Solution: Change the command so that the result is always a value in all branches of code
Arrow function is actually just a way of declaring a function. It doesn’t have to be a complicated definition, just think of it as a name. It is a concise syntax for writing functions in Js. Arrow functions are represented by the arrow character => , and by using Arrow functions you can simplify declaring anonymous functions in JavaScript.
In Eslint, when the consistent-return rule is enabled, the tool will automatically verify that all code paths in a function clearly give back a value or don’t return a value. The consistent-return rule will alert you if you accidentally forget to give back a value in one of the branches of a function that branches.
To handle the above error you can change the command so that the result is always a value in all branches of code like below:
$facetInput.on('keydown', (event) => {
if ((event.key === 'enter' || event.keyCode === 13) && event.target !== $submitButton) {
event.preventDefault();
return false;
}
return <something else>; // false, true, 'whatever' - up to you
});
With this approach, you can understand the following, eslint will return a result that you can implicitly understand when the if in the program you write is not true (eslint here is understood as does not depend on linter). For more information, you can refer to the following:
The fact that any function may or may not return a value at any time is one of the perplexing features of JavaScript. A function returns undefined if it terminates prematurely without executing any return statements. The function will return undefined if return is called without a value specified. The return value of the function changes only when return is invoked with a value.
After you do that, the error ”Expected to return a value at the end of arrow function consistent-return” will be completely resolved.
Conclusion
Above is the best solution we suggest for you to resolve the error “Expected to return a value at the end of arrow function consistent-return“. For best results, you should carefully read the instructions and advice in each section. If you like this topic, please look forward to our latest articles. Moreover, if you have any further difficulties, please discuss them with us below!
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