JSONata: words to lowerCamelCase

Question

I have a string consisting of words and punctuation, such as "Accept data protection terms / conditions (German)". I need to normalize that to camelcase, removing punctuation.

My closest attempt so far fails to camelcase the words, I only manage to make them into kebab-case or snake_case:

$normalizeId := function($str) <s:s> {
        $str.$lowercase()
            .$replace(/\s+/, '-')
            .$replace(/[^-a-zA-Z0-9]+/, '')
};

score 2 · Accepted Answer · answered Apr 22 '22 at 15:53

2

Anindya's answer works for your example input, but if (German) was not capitalized, it would result in the incorrect output:

"acceptDataProtectionTermsConditionsgerman"

Link to playground

This version would work and prevent that bug:

(
  $normalizeId := function($str) <s:s> {
        $str
            /* normalize everything to lowercase */
            .$lowercase()
            /* replace any "punctuations" with a - */
            .$replace(/[^-a-zA-Z0-9]+/, '-')
            /* Find all letters with a dash in front,
               strip the dash and uppercase the letter */
            .$replace(/-(.)/, function($m) { $m.groups[0].$uppercase() })
            /* Clean up any leftover dashes */
            .$replace("-", '')
  };

  $normalizeId($$)
  /* OUTPUT: "acceptDataProtectionTermsConditionsGerman" */
)

Link to playground

answered Apr 22 '22 at 15:53

vitorbal

2,871
24
24

1

Thanks for the answer. Nice alternative for try.jsonata! It supports the older v1.7.0, can I make it use v1.8.6? – dschulten Apr 22 '22 at 16:04
@dschulten unfortunately it doesn't have support for v1.8.6 _yet_. We're planning on adding it in the near future, though! – vitorbal Apr 27 '22 at 12:38
Hey @dschulten! Just wanted to let you know that https://www.stedi.com/jsonata/playground now supports v1.8.6 :) – vitorbal May 13 '22 at 12:26
great, will take a look – dschulten May 17 '22 at 10:05

Anindya Dey · Answer 2 · 2022-04-22T16:05:16.390

You should target the letters which has a space in front, and capitalize them by using this regex /\s(.)/.

Here is my snippet: (Edited

(
    $upper := function($a) {
        $a.groups[0].$uppercase()
    };
    
    $normalizeId := function($str) <s:s> {
        $str.$lowercase()
            .$replace(/[^-a-zA-Z0-9]+/, '-')
            .$replace(/-(.)/, $upper)
            .$replace(/-/, '')
    };

    $normalizeId("Accept data protection terms / conditions (German)");
)

/* OUTPUT: "acceptDataProtectionTermsConditionsGerman" */

Edit: Thanks @vitorbal. The "$lower" function on regex replacement earlier was not necessary, and did not handle the scenario you mentioned. Thanks for pointing that out. I have updated my snippet as well as added a link to the playground below.

Link to playground

Thank you for the quick response, very helpful! – dschulten Apr 22 '22 at 16:04 — dschulten, Apr 22 '22 at 16:04

JSONata: words to lowerCamelCase

2 Answers2