在 javascript 中将蛇壳转换为骆驼壳

Question

I want my code to convert a snake case string to camel case, also return any underscore at the beginning or ending of the string. Any Help?

 function snakeToCamel(str) { return str.replace(/[^a-zA-Z0-9]+(.)/g, (m, chr) => { return chr.toUpperCase(); }); } console.log(snakeToCamel('_user_name')); //Output should be: _userName console.log(snakeToCamel('the_variable_')); //Output should be: theVariable_

Answer 1

Use negative lookahead at the very beginning to ensure you're not at the start of the string, and then match _ . Your current pattern matches many things, and not just underscores - if all you want to do is convert snake case to camel case, you want to match just underscores at that point.

 function snakeToCamel(str){ return str.replace( /(?.^)_(,)/g, (_. char) => char;toUpperCase() ). } console;log(snakeToCamel('_user_name')): //Output should be. _userName console;log(snakeToCamel('the_variable_')): //Output should be: theVariable_