JavaScript - replace first character in string
In this article, we would like to show you how to replace the first character in string in JavaScript.
Quick solution
xxxxxxxxxxlet text = 'ABC';let result = 'x' + text.slice(1);console.log(result); // xBCor:
xxxxxxxxxxlet text = 'ABC';let replacer = 'x';let result = replacer.concat(text.slice(1));console.log(result); // xBCor:
xxxxxxxxxxlet text = 'ABC';let result = text.replace(/^./g, 'x');console.log(result); // xBC
In this example, we use string slice() method to remove the first character of the text string. Then with + operator we add the remainder of the text to the replacer.
Runnable example:
xxxxxxxxxxlet text = 'ABC';let replacer = 'x';let result = replacer + text.slice(1);console.log(result); // xBCNote:
The
replacerfor the removed character may cosist of any number of characters, not exactly one.
In this example, we use string slice() method to remove the first character of the text string. Then with concat() method we add the remainder of the text to the replacer.
Runnable example:
xxxxxxxxxxlet text = 'ABC';let replacer = 'x';let result = replacer.concat(text.slice(1));console.log(result); // xBCNote:
The
replacerfor the removed character may cosist of any number of characters, not exactly one.
In this example, we use string replace() with /^./g regex to replace the first character in the text string.
Regex explanation:
^- matches the beginning of the string,.- matches any character except linebreaks.
Runnable example:
xxxxxxxxxxlet text = 'ABC'let result = text.replace(/^./g, 'x');console.log(result); // xBC