String Array to JSON String

Question

Introduction

I've seen throughout the code-golf challenges several simple tasks involving JSON, such as interpreting JSON strings with RegExs, and almost every other manipulation I could think of.

In a binding for AppleScript that I was using for a Node project, I noticed that objects would be returned in a strange way: there would be an array of properties in string form, instead of a JSON object being returned as expected. This is where the challenge comes in...

Algorithm

Add { to beginning of the output string
Iterate over all entries, adding them to the output string, delimited by ,
Add } to the end of the output string
Print out the output string

Challenge

Make this strange return format usable. Convert an array of JSON 'key:value's (in string form) to a full JSON object string.

Rules

Any language that can do string manipulations allowed
Must print out JSON string with surrounding curly braces {}, and double quotes "" around string values AND all properties ("property":"value" or "property":3.14, etc.)
Must return a valid, parseable JSON string
Lowest byte count wins per language

Example Input and Output

Input:

['prop1:"val1"', 'prop2:12', 'prop3:3.14', 'prop4:false']

Output:

'{"prop1":"val1", "prop2":12, "prop3":3.14, "prop4":false}'

This challenge seems to be a code-golf challenge, but it doesn't say in the post. Could you make it more clear? — JungHwan Min
– JungHwan Min, Commented Jun 11, 2018 at 2:11
Hello, and welcome to the site. I'm voting to close this as unclear. There are a couple of things I find unclear. The first is that terms like "golfing" and "functional" languages are unclear, there are tons of edge cases. I'd recommend getting rid of the bonuses altogether, which would make this challenge clearer and better. It's also not clear to me exactly what the process is to change the strings to json is. I think it ought to be defined much more concretely. — Wheat Wizard
– Wheat Wizard ♦, Commented Jun 11, 2018 at 2:39
Your test case does not seem to match your description. In the test case it seems that quotations were placed around attribute names, but that is not apparent in your specification. — Wheat Wizard
– Wheat Wizard ♦, Commented Jun 11, 2018 at 3:05

Neil · Accepted Answer · 2018-07-27 00:04:49Z

2

JavaScript (Node.js), 35 bytes

a=>JSON.stringify(eval(`({${a}})`))

Try it online! 43 bytes without builtins:

a=>`{${a.map(s=>s.replace(/\w+/,`"$&"`))}}`

Try it online!

answered Jul 27, 2018 at 0:04

Neil

184k12 gold badges76 silver badges290 bronze badges

Add a comment |

Neil · Accepted Answer · 2018-07-27 00:13:01Z

1

Retina, 23 bytes

%0`\w+
"$&"
¶
,
.+
{$&}

Try it online! Explanation:

%0`\w+
"$&"

Quote all of the keys.

¶
,

Join the array elements together.

.+
{$&}

Wrap the result in brackets. This can also be done using the following code for the same byte count:

^
{
$
}

answered Jul 27, 2018 at 0:13

Neil

184k12 gold badges76 silver badges290 bronze badges

Add a comment |

Community · Accepted Answer · 2020-06-17 09:04:33Z

1

C 108

Thanks to Jonathan Frech this answer is now incredibly shorter
Thanks to @ceilingcat for some very nice pieces of golfing - now even shorter

i;main(c,v)char**v;{for(;++i<c;printf("%c\"%s\":%s",!~-i*79+44,v[i],++*v))*(*v=index(i[v],58))=0;puts("}");}

Try it online!

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Jun 11, 2018 at 3:07

Jerry Jeremiah

1,41210 silver badges10 bronze badges

\$\begingroup\$ 113 bytes, keeping with using a main function. \$\endgroup\$

Jonathan Frech
– Jonathan Frech

2018-06-11 16:57:08 +00:00
Commented Jun 11, 2018 at 16:57
\$\begingroup\$ 112 bytes. \$\endgroup\$

Jonathan Frech
– Jonathan Frech

2018-06-11 21:09:14 +00:00
Commented Jun 11, 2018 at 21:09
\$\begingroup\$ @JonathanFrech I would never have come up with !~-i++*79+44 That's not just golfed better - it's a better answer. Do you want to post it separately or shall i edit my answer? \$\endgroup\$

Jerry Jeremiah
– Jerry Jeremiah

2018-06-12 05:18:59 +00:00
Commented Jun 12, 2018 at 5:18
1

\$\begingroup\$ Regarding the golf: (i==1?"{":",") <-> (i==1?'{':',') (when using %c instead of %s) <-> (i==1?123:44) (substituting actual ASCII values) <-> 44+(123-44)*(i==1) <-> 44+79*(i==1) <-> 44+79*!(i!=1) <-> 44+79*!(i-1) <-> 44+79*!~-i <-> !~-i*79+44. The post-increment was used with regards to the entire program (not locally explainable). Regarding the posting: feel free to use the golfs in your post. \$\endgroup\$

Jonathan Frech
– Jonathan Frech

2018-06-12 16:57:03 +00:00
Commented Jun 12, 2018 at 16:57

Add a comment |

138 Aspen · Accepted Answer · 2023-04-29 07:43:26Z

1

Scala, 79 bytes

Essentially Neil's JS solve.

Try it online!

def f(a:Seq[String])="{"+a.map(_.replaceAll("\\w+","\"$0\"")).mkString(",")+"}"

answered Apr 29, 2023 at 7:43

138 Aspen

7,2771 gold badge5 silver badges18 bronze badges

Add a comment |

hyperneutrino · Accepted Answer · 2018-06-12 02:07:02Z

0

Python 3, 59 bytes

lambda x:"{%s}"%",".join('"'+a.replace(":",'":')for a in x)

Try it online!

-6 bytes thanks to ovs

edited Jun 12, 2018 at 2:07

answered Jun 11, 2018 at 17:02

hyperneutrino♦

42.8k5 gold badges72 silver badges227 bronze badges

\$\begingroup\$ 59 bytes using a.replace(':','":') \$\endgroup\$

ovs
– ovs

2018-06-11 17:13:00 +00:00
Commented Jun 11, 2018 at 17:13

Add a comment |

Visckmart · Accepted Answer · 2018-07-29 07:04:08Z

Lua, 122 bytes

loadstring[[s="{"for i,v in ipairs(...)do x,y=v:match("(.-):(.+)")s=s.."\""..x.."\":"..y..","end return s:sub(1,-2).."}"]]

Try it online!

This is an anonymous function. It technically doesn't "print out JSON string [...]", but instead it returns this string, so that when calling it you could print. I did that because I needed to first convert the input from string to an actual list, and I did that on the argument of the function call.

If this makes my answer invalid I'll move the string to table (list) "parser" from the footer to the actual code. But I don't think it should, because the input shown as a table, so the code that takes a string and transforms it into a table shouldn't count.

bigyihsuan · Accepted Answer · 2022-11-27 06:18:46Z

0

Go, 116 bytes

import."strings"
func f(s[]string)string{for i,l:=range s{s[i]=`"`+Replace(l,`:`,`":`,1)}
return"{"+Join(s,",")+"}"}

Attempt This Online!

answered Nov 27, 2022 at 6:18

bigyihsuan

11.4k1 gold badge30 silver badges70 bronze badges

Add a comment |

south · Accepted Answer · 2022-11-29 23:32:14Z

0

Ruby, 41 40 bytes

->a{?{+a.map{_1.sub /\w+/,'"\&"'}*?,+?}}

Essentially Neil's JS solve.

Attempt This Online!

answered Nov 29, 2022 at 23:32

south

2,3209 silver badges13 bronze badges

Add a comment |

IY5dVSjABEeV · Accepted Answer · 2022-12-09 10:06:13Z

POSIX sh (sed + ShellShoccar-jpn/Parsrs makrj.sh), 33 bytes

Assumes values may have colons but properties shall never have colons, spaces, tabs, or periods.

sed 's/\([^:]*\):/.\1 /'|makrj.sh

Usage

Input via standard input. Each line represents each item of an array.

Commented

# "prop:item"
sed 's/\([^:]*\):/.\1 /'|
# ".prop item" is JSONPath-value format
makrj.sh
# JSON object

Example run on Termux

~ $ sh makrj.sh -h
Usage : makrj.sh [JSON_value_textfile]
Wed Sep 14 22:19:55 JST 2016
~ $ cat jsss;echo;cat jsss | sed 's/\([^:]*\):/.\1 /'|sh makrj.sh
prop1:"val1"
prop2:12
prop3:3.14
prop4:false

{
"prop1":"val1",
"prop2":12,
"prop3":3.14,
"prop4":false
}
~$

Stack Exchange Network

String Array to JSON String

Introduction

Algorithm

Challenge

Rules

Example Input and Output

9 Answers 9

JavaScript (Node.js), 35 bytes

Retina, 23 bytes

C 108

Scala, 79 bytes

Python 3, 59 bytes

Lua, 122 bytes

Go, 116 bytes

Ruby, 41 40 bytes

POSIX sh (sed + ShellShoccar-jpn/Parsrs makrj.sh), 33 bytes

Usage

Commented

Example run on Termux

Your Answer

Hot Network Questions

String Array to JSON String

Introduction

Algorithm

Challenge

Rules

Example Input and Output

9 Answers 9

JavaScript (Node.js), 35 bytes

Retina, 23 bytes

C 108

Scala, 79 bytes

Python 3, 59 bytes

Lua, 122 bytes

Go, 116 bytes

Ruby, 41 40 bytes

POSIX sh (sed + ShellShoccar-jpn/Parsrs makrj.sh), 33 bytes

Usage

Commented

Example run on Termux

Your Answer

Sign up or log in

Post as a guest

Related

Hot Network Questions