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How to Get the Substring Before a Character in JavaScript 📌[All Method]️

The blog is about How to Get the Substring Before a Character in JavaScript & provides a lot of information to the novice user and the more seasoned user. By the end of this guide, you will know how to handle these types of problems.
Question: What is the best solution for this problem? Answer: This blog code can help you solve errors How to Get the Substring Before a Character in JavaScript. Question: “What should you do if you run into code errors?” Answer:”You can find a solution by following this blog.

Recently, I had to manipulate a string to obtain information that followed a certain structure.

The example below is similar to what I had to do.

I wanted to get name, which was followed by a colon :.

let str = "name: description";

There were a few ways I could’ve gone about this.

Using split()

str = str.split(":")[0];

In str.split(":"), the parameter acts as a delimiter in the string, and each element is returned inside an array.

For the string above, the result is:

["name", " description"]

This is why I am accessing the zeroth element.

Using substring() and indexOf()

str = str.substring(0, str.indexOf(":"));

str.indexOf(":") returns 4, so we are obtaining the string from index 0 (inclusive) to 4 (exclusive).

Using regex

str = /(.+):/.exec(str)[0];

(.+) matches any number of word characters.

: matches, well, a colon.


Revise the code and make it more robust with proper test case and check an error there before implementing into a production environment.
If you need help at any point, please send me a message and I will do my best to assist you.

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