Javascript Range

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For a long time, when writing different functions, we may want to create ranges to work with certain data. A range represents data in an array or object with a start and end value.

Many languages ‚Äã‚Äãhave built-in methods for creating ranges, for example to_a in Ruby:

JavaScript doesn’t have a specific built-in method for it, but there is many ways to create ranges. We will show you three of them.

_.range () - Lodash

If we want to create a range of numbers and we want them faster possible, we can use the Lodash _.range () util method.

This method returns an array and accepts three arguments: the first for the start of the interval, the second for the end of the interval (up) and the third for no or increased / decreased value by.

Note that if only one argument is given, it will create a range up to the number specified. Also, don’t forget that Lodash is a JavaScript library that we have to install separately!

Create our function range () .

If we want to save overhead, we can create our own number range function. It turns out that creating our range is pretty straightforward.

It’s easy to write and you can avoid importing libraries like Lodash for a single function!

Creating a non-numeric range function

Now you might be wondering, what about non-numeric ranges, such as characters ? There are a few options for us to implement it with JavaScript.

Here we will use the charCodeAt () method to get a number that we will then increment and then insert into an array using the String.fromCharCode () , which returns a character from a character code.

Was it easier than I thought?

Conclusion

No You know how easy it can be to create ranges with JavaScript. Be sure to save these useful features, we are sure you will find them useful sooner or later !

👻 Read also: what is the best laptop for engineering students?

We hope this article has helped you to resolve the problem. Apart from Javascript Range, check other array Python module-related topics.

Want to excel in Python? See our review of the best Python online courses 2023. If you are interested in Data Science, check also how to learn programming in R.

By the way, this material is also available in other languages:



Marie Emmerson

Prague | 2023-02-01

I was preparing for my coding interview, thanks for clarifying this - Javascript Range in Python is not the simplest one. I just hope that will not emerge anymore

Dmitry Sikorski

San Francisco | 2023-02-01

Simply put and clear. Thank you for sharing. Javascript Range and other issues with numbers Python module was always my weak point 😁. I am just not quite sure it is the best method

Xu OConnell

Singapore | 2023-02-01

I was preparing for my coding interview, thanks for clarifying this - Javascript Range in Python is not the simplest one. Will get back tomorrow with feedback

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