JavaScript: How to Get a Substring Until a Specific Character

In JavaScript, there are several ways to extract a substring from a string until a specific character is encountered. This can be useful when you want to retrieve the first part of a string before a certain delimiter, such as a hyphen ("-").

One simple approach is to use the split() method, which splits a string into an array of substrings based on a specified delimiter. By specifying the hyphen as the delimiter, we can extract the desired substring by accessing the first element of the resulting array.

Here’s an example of how you can achieve this:

const str = 'test-hey-ho';
const substring = str.split('-')[0]; // 'test'

In this example, the str variable holds the original string “test-hey-ho”. By calling the split('-') method, the string is split into an array at each occurrence of the hyphen. By accessing the first element of the resulting array ([0]), we obtain the substring “test”.

It’s important to note that if the specified character is not found in the string, the split() method will return the entire string as a single element in the array. Therefore, when extracting a substring until a specific character, you need to ensure that the character exists in the string to avoid unexpected behavior.

In summary, by using the split() method and accessing the first element of the resulting array, you can easily obtain a substring until a specified character in JavaScript.