In this article, we will show you how to replace the first character in a string in JavaScript in many different ways like using the replace() method and using the slice() method. Start reading the detailed article.
Replace the first character in a string in JavaScript
Using the replace() method
The simple and easy way is using the replace() method to do it. This method has been introduced by us here. Please read it to get more information.
Code example:
In this example, we create the myString variable l in lowercase. Then we call the replace method with .^ regular expression and global g to replace to uppercase.
const myString = 'learnShareIT';
console.log("My string is: ", myString);
// Using the replace() method with ^. to replace l to L character
const newString = myString.replace(/^./g, 'L');
console.log("After replacing the first occurrence of character: ", newString); // LearnShareITOutput
My string is: learnShareIT
After replacing the first occurrence of character: LearnShareITUsing string slice() with + operator
The second way is using the slice() method with the + operator. This method will return the slow copy of a portion of an array into a new array object. The original array will not be modified. Let’s see the code example below:
const myString = 'learnShareIT';
console.log("My string is: ", myString);
// Using the slice() method with -1 and + 'L' operator
const newString = 'L' + myString.slice(1);
console.log("After replacing the first occurrence of character: ", newString); // LearnShareITOutput
My String is: learnShareIT
After replacing the first occurrence of character: LearnShareITUsing string slice() with concat() method
The last way is using the concat() method and string slice() method. The concat() method will return a new string containing the combined strings. And using the string slice method to replace the first occurrence character in myString.
Example:
const myString = 'learnShareIT';
console.log("My string is: ", myString);
// Using the string slice() with concat() method
const newString = 'L'.concat(myString.slice(1));
console.log("After replacing the first occurrence of character: ", newString); // LearnShareITOutput
My string is: learnShareIT
After replacing the first occurrence of character: LearnShareITSummary
Hopefully, through this article, you can choose for yourself the best way to replace the first character in a string in JavaScript. For us, using the replace() method to solve this problem is the best way to solve this problem. Have a nice day and thank for your reading!
Maybe you are interested:
- Replace the First Occurrence of Character in String in JS
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My name is Fred Hall. My hobby is studying programming languages, which I would like to share with you. Please do not hesitate to contact me if you are having problems learning the computer languages Java, JavaScript, C, C#, Perl, or Python. I will respond to all of your inquiries.
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Programming Languages: Java, JavaScript, C , C#, Perl, Python