如何使用javascript正则表达式将字符串转换为驼峰大小写?
设备类名称或 设备类名或设备类名或设备类名
应该全部变成:equipmentClassName。
如何使用javascript正则表达式将字符串转换为驼峰大小写?
设备类名称或 设备类名或设备类名或设备类名
应该全部变成:equipmentClassName。
当前回答
为了有效地创建一个将字符串的大小写转换为驼峰式大小写的函数,该函数还需要首先将每个字符串转换为小写,然后再将非第一个字符串的第一个字符转换为大写字母。
我的示例字符串是:
"text That I WaNt to make cAMEL case"
对于这个问题提供的许多其他解决方案返回这个:
"textThatIWaNtToMakeCAMELCase"
我认为应该是预期的,期望的输出将是这样的,其中所有的中间字符串大写字符首先转换为小写:
"textThatIWanrtToMakeCamelCase"
这可以在不使用任何replace()方法调用的情况下完成,通过使用String.prototype.split(), Array.prototype.map()和Array.prototype.join()方法:
≤ES5版本
function makeCamelCase(str) {
return str
.split(' ')
.map((e,i) => i
? e.charAt(0).toUpperCase() + e.slice(1).toLowerCase()
: e.toLowerCase()
)
.join('')
}
makeCamelCase("text That I WaNt to make cAMEL case")
// -> "textThatIWanrtToMakeCamelCase" ✅
我将分解每一行的功能,然后以其他两种格式提供相同的解决方案——ES6格式和字符串格式。prototype方法,不过我建议不要像这样直接扩展内置的JavaScript原型。
讲解员
function makeCamelCase(str) {
return str
// split string into array of different words by splitting at spaces
.split(' ')
// map array of words into two different cases, one for the first word (`i == false`) and one for all other words in the array (where `i == true`). `i` is a parameter that denotes the current index of the array item being evaluated. Because indexes start at `0` and `0` is a "falsy" value, we can use the false/else case of this ternary expression to match the first string where `i === 0`.
.map((e,i) => i
// for all non-first words, use a capitalized form of the first character + the lowercase version of the rest of the word (excluding the first character using the slice() method)
? e.charAt(0).toUpperCase() + e.slice(1).toLowerCase()
// for the first word, we convert the entire word to lowercase
: e.toLowerCase()
)
// finally, we join the different strings back together into a single string without spaces, our camel-cased string
.join('')
}
makeCamelCase("text That I WaNt to make cAMEL case")
// -> "textThatIWanrtToMakeCamelCase" ✅
压缩ES6+(一行程序)版本
const makeCamelCase = str => str.split(' ').map((e,i) => i ? e.charAt(0).toUpperCase() + e.slice(1).toLowerCase() : e.toLowerCase()).join('')
makeCamelCase("text That I WaNt to make cAMEL case")
// -> "textThatIWanrtToMakeCamelCase" ✅
字符串。原型方法版本
String.prototype.toCamelCase = function() {
return this
.split(' ')
.map((e,i) => i
? e.charAt(0).toUpperCase() + e.slice(1).toLowerCase()
: e.toLowerCase()
)
.join('')
}
"text That I WaNt to make cAMEL case".toCamelCase()
// -> "textThatIWanrtToMakeCamelCase" ✅
其他回答
我最终想出了一个稍微激进一点的解决方案:
function toCamelCase(str) {
const [first, ...acc] = str.replace(/[^\w\d]/g, ' ').split(/\s+/);
return first.toLowerCase() + acc.map(x => x.charAt(0).toUpperCase()
+ x.slice(1).toLowerCase()).join('');
}
上面的这个方法将删除所有非字母数字字符和单词的小写部分,否则将保持大写,例如。
Size (comparative) => Size比较 GDP(官方汇率)=> Hello => Hello
此函数通过通过cammelcase等这些测试
Foo酒吧 ——foo bar __FOO_BAR__ - foo123Bar foo_Bar
function toCamelCase(str) { var arr= str.match(/[a-z]+|\d+/gi); return arr.map((m,i)=>{ let low = m.toLowerCase(); if (i!=0){ low = low.split('').map((s,k)=>k==0?s.toUpperCase():s).join`` } return low; }).join``; } console.log(toCamelCase('Foo Bar')); console.log(toCamelCase('--foo-bar--')); console.log(toCamelCase('__FOO_BAR__-')); console.log(toCamelCase('foo123Bar')); console.log(toCamelCase('foo_Bar')); console.log(toCamelCase('EquipmentClass name')); console.log(toCamelCase('Equipment className')); console.log(toCamelCase('equipment class name')); console.log(toCamelCase('Equipment Class Name'));
我知道这是一个老答案,但这处理空格和_ (lodash)
function toCamelCase(s){
return s
.replace(/_/g, " ")
.replace(/\s(.)/g, function($1) { return $1.toUpperCase(); })
.replace(/\s/g, '')
.replace(/^(.)/, function($1) { return $1.toLowerCase(); });
}
console.log(toCamelCase("Hello world");
console.log(toCamelCase("Hello_world");
// Both print "helloWorld"
我认为这应该可行。
function cammelCase(str){
let arr = str.split(' ');
let words = arr.filter(v=>v!='');
words.forEach((w, i)=>{
words[i] = w.replace(/\w\S*/g, function(txt){
return txt.charAt(0).toUpperCase() + txt.substr(1);
});
});
return words.join('');
}
您可以使用以下解决方案:
String.prototype.toCamelCase = function(){ return this.replace(/\s(\w)/ig, function(all, letter){return letter. touppercase ();}) .replace (/ (^ \ w)、功能(1美元){返回1.美元tolowercase ()}); }; console.log(“设备名称”.toCamelCase ());