I would like transform string with uppercase to string with underscore like :
- "blablaBlabla" to "blabla_blabla" - "firstName" to "first_name"
And conversely :
- "blabla_blabla" to "blablaBlabla" - "first_Name" to "firstName"
I use Typescript, but I think for that, there is no difference with the Javascript.
Thank’s in advance.
Jérémy.
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Answer
let word = "firstName"; let output = ""; // for conversion for (let i = 0; i < word.length; i++) { if (word[i] === word[i].toUpperCase()) { output += "_" + word[i].toLowerCase(); } else { output += word[i]; } } console.log(output); let source = output; output = ""; //for reversion for (let i = 0; i < source.length; i++) { if (source[i] === "_") { i++; output += source[i].toUpperCase(); } else { output += source[i]; } } console.log(output);