Author: John Au-Yeung

Sometimes, we want to use regex to get string between curly braces with JavaScript.

In this article, we’ll look at how to use regex to get string between curly braces with JavaScript.

How to use regex to get string between curly braces with JavaScript?

To use regex to get string between curly braces with JavaScript, we can use the /{(.*?)}/ regex.

For instance, we write

const re = /{(.*?)}/;

to use the re regex to get the string between curly braces.

We use (.*?) inside the curly braces to match anything inside the curly braces.

Conclusion

To use regex to get string between curly braces with JavaScript, we can use the /{(.*?)}/ regex.

Sometimes, we want to filter or map nodelists in JavaScript.

In this article, we’ll look at how to filter or map nodelists in JavaScript.

How to filter or map nodelists in JavaScript?

To filter or map nodelists in JavaScript, we can use the spread operator.

For instance, we write

const arr = [...nodelist];

to convert the nodelist to an array with the spread operator.

Then we can call map or filter on it to do the mapping or filtering like any other array.

Conclusion

To filter or map nodelists in JavaScript, we can use the spread operator.

Sometimes, we want to call split with regex in JavaScript.

In this article, we’ll look at how to call split with regex in JavaScript.

How to call split with regex in JavaScript?

To call split with regex in JavaScript, we call split with a regex to split by any substring that matches the pattern.

For instance, we write

const rawElements = str.split(new RegExp("[,;\n]", "g"));

to call str.split with new RegExp("[,;\n]", "g") to split the str string by commas, semicolons, and newlines.

We use the 'g' flag to match all instances.

The split strings will be returned in an array.

Conclusion

To call split with regex in JavaScript, we call split with a regex to split by any substring that matches the pattern.

Sometimes, we want to run only one test with Jest.

In this article, we’ll look at how to run only one test with Jest.

How to run only one test with Jest?

To run only one test with Jest, we can use fit, fdescribe, it.only, or describe.only and specify the test file to run.

We edit the test file to have fit, fdescribe, it.only, or describe.only to specify that we only run the test created with those functions.

And then we run

jest test.js

to run the test file with the fit, fdescribe, it.only, or describe.only calls in it.

We replace test.js with the path of the test file.

Conclusion

To run only one test with Jest, we can use fit, fdescribe, it.only, or describe.only and specify the test file to run.