I am generating some meaningful name with the following rule in a JavaScript/Node JS program:
Input: "tenancy_account__accountPublicId__workspace__workspacePublicId__remove-user__userPublicId"
Expected output: "TenancyAccountAccountPublicIdWorkspaceWorkspacePublicIdRemove-userUserPublicId"
Rules:
x | __*x => XThis is what is tried so far, looking for better alternatives, if any:
const convertBetterString = (input) => {
const finalString = [];
if (input && input.includes('_')) {
const inputStringSeparation = input.split('_');
if (inputStringSeparation.length > 1) {
if (inputStringSeparation[inputStringSeparation.length - 1] === '') {
inputStringSeparation.splice(inputStringSeparation.length - 1, 1);
}
inputStringSeparation.forEach((val, index) => {
if (val === '' && inputStringSeparation[index + 1]) {
const actualString = inputStringSeparation[index + 1];
const formattedString = actualString.charAt(0).toUpperCase() + actualString.slice(1);
finalString.push(formattedString);
}
});
return finalString.length > 0 ? finalString.join('') : inputStringSeparation.join('');
} else {
return input.charAt(0).toUpperCase() + input.slice(1);
}
} else {
return input;
}
}
Split and slice
const capitalise = str => str.slice(0,1).toUpperCase() + str.slice(1); // you can add more tests
const str = "tenancy_account__accountPublicId__workspace__workspacePublicId__remove-user__userPublicId"
const newStr = str.split(/_+/)
.map(word => capitalise(word))
.join("")
console.log(newStr)Regexp with optional chaining
const str = "tenancy_account__accountPublicId__workspace__workspacePublicId__remove-user__userPublicId_"
const newStr = str.replace(/(?:_+|^)(\w)?/g, (_,letter) => letter?.toUpperCase() ?? "")
console.log(newStr)Explanation
(?:_+|^) non-capturing the underscore OR start
(\w)? followed by 0 or 1 letter to be captured
(_,letter) => letter?.toUpperCase() ?? "") ignore the match and uppercase the letter if found, that ignores trailing underscores too
You can use
const str = "tenancy_account__accountPublicId__workspace__workspacePublicId__remove-user__userPublicId__";
const newStr = str
.replace(/(?:^|_)_*([^\s_])|_+$/g, (_, x) => x ? x.toUpperCase() : '')
console.log(newStr);The /(?:^|_)_*([^\s_])|_+$/g regex matches all occurrences of
(?:^|_) - start of string or __* - zero or more underscores([^\s_]) - Group 1: any char other than whitespace and _.| - or_+$ - one or more _s at the end of string.The (_, x) => x ? x.toUpperCase() : '' replacement remove all the underscores (even if they are at the end of string) and turns the Group 1 value (x) to upper case.