Regex is really great for finding and/or replacing things.
I have files named my-file-name.js
or my_file_name.js
and want to change them to camelCase myFileName.js
.
function toCamelCase(name) {
// search for "-" or "_" followed by a character and replace it uppercased
return name.replace(/[-_]([a-z])/gi, (_, char) => char.toUpperCase());
}
Explanation:
/ => starts the regex
[-_] => - or _
([a-z]) => all lowercase letters, captured in a group
/ => ends the regex
gi => search all occurencies, ignore case
(_, char) => char.toUpperCase() => _ is the passed in complete match, don't need it;
return the capture group (= the letter after - or _) uppercased
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