javascript - 尝试转换为驼峰式时，toUpperCase无法在for循环中工作(toUpperCase not working in for loop when trying to convert to camel case)

Question

I looked at some other questions, haven't found one specific to this issue.(我查看了其他一些问题，但尚未找到特定于此问题的问题。)

Here is what I have:(这是我所拥有的：) function toCamelCase(str){ const _str = str.split(/-|_/) for (let i = 0; i < _str.length; i++) { // if first character of string is capital, // make it Pascal Case, not Camel Case if (i === 0) { _str[i][0] = _str[i][0].match(/[A-Z]/) ? _str[i][0].toUpperCase() : _str[i][0].toLowerCase() } else { _str[i][0] = _str[i][0].toUpperCase() } } return _str.join("") } toCamelCase("This-is_a_test-string") // Thisisateststring The output should be ThisIsATestString , but for some reason it is not working.(输出应该是ThisIsATestString ，但是由于某种原因它不起作用。) What's weird is that the first if (i === 0) .. enters and assigns properly, but the rest doesn't work, even though it is entered.(奇怪的是，第一个if (i === 0) ..正确输入和分配，但是其余的即使输入也不能正常工作。)   ask by Mike K translate from so

Answer 1

Why not use a replacement with a function for a single letter?(为什么不对单个字母使用功能替换呢？)

const toCamelCase = string => string.replace(/[_\-](.)/g, (_, g) => g.toUpperCase()); console.log(toCamelCase("This-is_a_test-string"));