Remove a suffix from a string in JavaScript
This post will discuss how to remove a suffix from a string in JavaScript.
A suffix is a part of a string that comes at the end, such as “.txt”, “ing”, or “tion”. To remove a suffix from a string in JavaScript, we need to use some function or function that can find and replace the suffix in the string. Here are some of the common functions:
1. Using replace() function
The replace() function can be used to remove a part of a string with another string. To remove the suffix from a string, we can replace it with an empty string. For example, to remove the suffix "px" from a string, we can use the following code:
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let str = "100px"; // A string with a suffix let suffix = "px"; // The suffix to remove // Replace the suffix with an empty string let result = str.replace(suffix, ""); // Prints "100" console.log(result); |
We can also use a regular expression to match the suffix we want to remove, and replace it with an empty string. The following code illustrates this:
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let str = "100px"; // A string with a suffix let suffix = "px"; // The suffix to remove // Replace the suffix with an empty string let result = str.replace(new RegExp(suffix + "$"), ""); // Prints "100" console.log(result); |
The regular expression matches the "px" at the end of the string, and the second argument "" is the replacement string. We can also use variables or capture groups in the regular expression to remove dynamic suffixes.
2. Using slice() or substring() functions
These functions can be used to remove a known number of characters from the end of a string by specifying the start and end indices of the substring. For example, to remove the last two characters from a string, we can use:
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let str = "100px"; // A string with a suffix let suffix = "px"; // The suffix to remove // Remove the last two characters let result = str.slice(0, -suffix.length); // Prints "100" console.log(result); |
The slice() function takes a negative index as the second argument, which means counting from the end of the string. The substring() function takes a positive index as the second argument, which means the length of the substring. Here’s an example:
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let str = "100px"; // A string with a suffix let suffix = "px"; // The suffix to remove // Remove the last two characters let result = str.substring(0, str.length - suffix.length); // Prints "100" console.log(result); |
3. Using parseInt() or parseFloat() functions
These functions can be used to remove any non-numeric suffix from a string by parsing it as a number. The parseInt() function takes a second argument as the radix (base) of the number, which is usually 10 for decimal numbers. For example, to remove the suffix "px" from a string, we can use:
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// A string with a suffix let str = "100px"; // Parse the string as an integer let result = parseInt(str, 10); // Prints "100" console.log(result); |
The parseFloat() function can be used for non-integer numbers. These functions will ignore any non-numeric characters at the end of the string. However, they will not work if there are non-numeric characters in the middle of the string.
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// A string with a suffix let str = "90.5%"; // Parse the string as a float let result = parseFloat(str, 10); // Prints "90.5" console.log(result); |
That’s all about removing a suffix from a string in JavaScript.
Thanks for reading.
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