Getting the substring before a specific character in JavaScript is a task you often encounter during programming. This article will show you how to get the substring before a specific character in JavaScript. It’s helpful for you. Read on it now.
Get the substring before a specific character in JavaScript
Getting the substring before a specific character in JavaScript is a task you often encounter during programming. Example: You have the string “1000 people visit LearnShareIT per hour”, and you want to get a substring as the number of visitors. The substring you need is the substring before the first ” ” character.
If you want to get the substring before a specific character in JavaScript, you can use the following three methods:
- substr()
- substring()
- split()
Each of the above methods has its uses and properties. We will show you how to use each method to get the substring before a specific character.
Solution 1: Use the substr() method
The substr() method extracts substrings from a string without changing the original string.
Syntax:
string.substr(start, length)Parameter:
- Start: specified starting position, the index starts from 0.
- Length: a specified number of characters.
Example:
We have the string “1000 people visit LearnShareIT per hour”. We want to get the substring before the first ” ” character.
const visit = '1000 people visit LearnShareIT per hour';
const visitors = visit.substr(0, visit.indexOf(' '));
console.log(visitors);Output:
1000The above example uses the substr() method with the first parameter, 0. In the second parameter, we use the indexOf() method. The indexOf() method will return the first position of a specified character, and in this example, the character ” “.
Solution 2: Use the substring() method
Like the substr() method, the substring() method extracts substrings from a string without changing the original string.
Syntax:
string.substring(start, end)Parameter:
- Start: specified starting position, the index starts from 0.
- End: End position (not including).
Example:
We have the string “1000 people visit LearnShareIT per hour”. We want to get the substring before the first ” ” character.
const visit = '1000 people visit LearnShareIT per hour';
const visitors = visit.substring(0, visit.indexOf(' '));
console.log(visitors);Output:
1000Because the second parameter of the substring() method is the end position (but not included), the above code will return the substring of the original string from position 0 to before the first ” ” character position.
Alternatively, you can use the lastIndexOf() method to get the substring before the last occurrence of a specific character.
Solution 3: Use the split() method
The split() method splits the original string into substrings and puts them in an array without mutating the original string.
Syntax:
string.split(separator, limit)Parameter:
- Separator: a string used for splitting.
- Limit: limit the number of splits.
We will show an example of how to use the split() method similar to the previous two solutions.
Example:
const visit = '1000 people visit LearnShareIT per hour';
const visitors = visit.split(' ');
console.log(visitors[0]);Output:
1000The above example uses the split method to get the substring before a specific character. The method’s first parameter is ” “, which means that the original string will be split word by word and put into an array. The word with index 0 is the substring before the first ” ” character.
Summary
We hope you enjoy our article about how to get the substring before a specific character in JavaScript. The information in this article is helpful to you. If you have any questions, please comment below. Thank you for reading!
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Hello, my name’s Bruce Warren. You can call me Bruce. I’m interested in programming languages, so I am here to share my knowledge of programming languages with you, especially knowledge of C, C++, Java, JS, PHP.
Name of the university: KMA
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Programming Languages: C, C++, Java, JS, PHP