Lodash 标题大小写（每个单词的大写首字母）

Question

I'm looking through the lodash docs and other Stack Overflow questions - while there are several native JavaScript ways of accomplishing this task , is there a way I can convert a string to title case using purely lodash functions (or at least existing prototypal functions) so that I don't have to use a regular expression or define a new function?

eg

This string ShouLD be ALL in title CASe

should become

This String Should Be All In Title Case

Answer 1

这可以通过对startCase进行小的修改来startCase ：

_.startCase(_.toLower(str));

 console.log(_.startCase(_.toLower("This string ShouLD be ALL in title CASe")));

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.13.1/lodash.min.js"></script>

Answer 2

_.startCase(_.camelCase(str))

For non-user-generated text, this handles more cases than the accepted answer

> startCase(camelCase('myString'))
'My String'
> startCase(camelCase('my_string'))
'My String'
> startCase(camelCase('MY_STRING'))
'My String'
> startCase(camelCase('my string'))
'My String'
> startCase(camelCase('My string'))
'My String'

Answer 3

使用 lodash 版本 4。

_.upperFirst(_.toLower(str))

Answer 4

'This string ShouLD be ALL in title CASe'
  .split(' ')
  .map(_.capitalize)
  .join(' ');

Answer 5

There are mixed answers to this question. Some are recommending using _.upperFirst while some recommending _.startCase .

Know the difference between them.

i) _.upperFirst will transform the first letter of your string, then string might be of a single word or multiple words but the only first letter of your string is transformed to uppercase.

_.upperFirst('jon doe')

output:

Jon doe

check the documentation https://lodash.com/docs/4.17.10#upperFirst

ii) _.startCase will transform the first letter of every word inside your string.

_.startCase('jon doe')

output:

Jon Doe

https://lodash.com/docs/4.17.10#startCase

Answer 6

这是一种只使用 lodash 方法而不使用内置方法的方法：

_.reduce(_.map(_.split("Hello everyOne IN the WOrld", " "), _.capitalize), (a, b) => a + " " + b)

Answer 7

That's the cleanest & most flexible implementation imo from testing it on my own use cases.

import { capitalize, map } from "lodash";

const titleCase = (str) => map(str.split(" "), capitalize).join(" ");

// titleCase("ALFRED NÚÑEZ") => "Alfred Núñez"
// titleCase("alfred núñez") => "Alfred Núñez"
// titleCase("AlFReD nÚñEZ") => "Alfred Núñez"
// titleCase("-") => "-"

Answer 8

const titleCase = str =>
  str
    .split(' ')
    .map(str => {
      const word = str.toLowerCase()
      return word.charAt(0).toUpperCase() + word.slice(1)
    })
    .join(' ')

You can also split out the map function to do separate words

Answer 9

This can be done with only lodash

properCase = string =>
        words(string)
            .map(capitalize)
            .join(' ');

const proper = properCase('make this sentence propercase');

console.log(proper);
//would return 'Make This Sentence Propercase'

Answer 10

 var s = 'This string ShouLD be ALL in title CASe';
 _.map(s.split(' '), (w) => _.capitalize(w.toLowerCase())).join(' ')

Unless i missed it, lodash doesnt have its own lower/upper case methods.

Answer 11

Not as concise as @4castle's answer, but descriptive and lodash-full, nonetheless...

 var basicTitleCase = _ .chain('This string ShouLD be ALL in title CASe') .toLower() .words() .map(_.capitalize) .join(' ') .value() console.log('Result:', basicTitleCase) console.log('Exact Match:' , basicTitleCase === 'This String Should Be All In Title Case')

 <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.13.1/lodash.min.js"></script>

Answer 12

Here's another solution for my use case: "devil's backbone"

Simply:

function titleCase (str) {
  return _.map(str.split(' '), _.upperFirst).join(' ');
}

Using startCase would remove the apostrophe, so I had to work around that limitation. The other solutions seemed pretty convoluted. I like this as it's clean, easy to understand.

Answer 13

Below code will work perfectly:

var str = "TITLECASE";
_.startCase(str.toLowerCase());

Answer 14

From https://github.com/lodash/lodash/issues/3383#issuecomment-430586750

'JHON&JOHN C/O DR. BLah'.replace(/\w+/g, _.capitalize);

result:

'Jhon&John C/O Dr. Blah'

Answer 15

with lodash 4, you can use _.capitalize()

_.capitalize('JOHN') It returns 'John'

See https://lodash.com/docs/4.17.5#capitalize for details