[英]Transform a string from camel case to snake case and vice versa
I would like transform string with uppercase to string with underscore like:我想将大写字符串转换为带下划线的字符串,例如:
- "blablaBlabla" to "blabla_blabla"
- "firstName" to "first_name"
And conversely:反过来:
- "blabla_blabla" to "blablaBlabla"
- "first_Name" to "firstName"
I use Typescript, but I think for that, there is no difference with the Javascript.我用的是Typescript,不过我觉得和Javascript没什么区别。
Thank's in advance.提前致谢。
Jérémy.杰里米。
You could get all the upper case letters with [AZ]
and replace
the match with _ + m.toLowerCase()
您可以使用
[AZ]
获取所有大写字母,并使用_ + m.toLowerCase()
replace
匹配项
To change it the other way, match all _([az])
to get the alphabet to a capturing group.要以另一种方式更改它,请匹配所有
_([az])
以将字母表添加到捕获组中。 And then use toUpperCase
on the capture然后在捕获上使用
toUpperCase
function trasnform1(str) { return str.replace(/[AZ]/g, (m) => '_' + m.toLowerCase()) } function trasnform2(str) { return str.replace(/_([az])/g, (m, p1) => p1.toUpperCase()) } console.log(trasnform1("blablaBlabla")) console.log(trasnform1("firstName")) console.log(trasnform2("blabla_blabla")) console.log(trasnform2("first_name"))
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);
// Camel to snake and snake to camel case
function changeCasing(input) {
if (!input) {
return '';
}
if (input.indexOf('_') > -1) {
const regex = new RegExp('_.', 'gm');
return input.replace(regex, (match) => {
const char = match.replace("_", "");
return char.toUpperCase();
});
} else {
const regex = new RegExp('[A-Z]', 'gm');
return input.replace(regex, (match) => {
return `_${match.toLowerCase()}`;
});
}
}
This is example written in TypeScript. It's more readable using method chaining.这是在 TypeScript 中编写的示例。使用方法链接更具可读性。
export const snake2Camel = (snake: string): string => {
return snake.split('').reduce((prev: string, cur: string) => {
if (prev.includes("_")) {
prev = prev.substring(0, prev.length - 1);
cur = cur.toUpperCase();
}
return prev + cur;
}, "");
};
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