What's my PPCG ID?

Question

Challenge

Given the name of a PPCG member, output their PPCG ID number. If the user does not exist, you may report an error or return any non-positive number. If there are multiple members with this name, you may choose to output only one ID or all of them.

Test Cases

"musicman523" -> 69054
"Dennis" -> 12012
"xnor" -> 20260
"Leaky Nun" -> 48934
"fəˈnɛtɪk" -> 64505
"Jörg Hülsermann" -> 59107
"Community" -> -1
"Any user that does not exist" -> 0
"Alex" -> 69198 (this is one possible result)
"Leaky N" -> 0
"Jorge" -> 3716

Answer 1

Stack Exchange Data Explorer, 56 54 53 51 46 bytes

-1 byte thanks to Hyper Neutrino. -5 bytes thanks to Giacomo Garabello.

SELECT ID FROM USERS WHERE##S##=DISPLAYNAME--S

Try it online!

Not sure if this is completely valid but... Input must be surrounded in single quotes '.

Also, I still don't get why SQL programmers like to shout but it's apparently good practise so... SELECT EVERYTHING FROM EVERYTHING WHERE EVERYTHING LIKE EVERYTHING!

Explanation

LET ME EXPLAIN.

SELECT ID FROM USERS WHERE##S##=DISPLAYNAME--S

                                           --S  -- DECLARE AN INPUT PARAMETER NAMED S
SELECT                                          -- FIND...
       ID                                       -- ID OF THE USERS...
          FROM USERS                            -- IN THE TABLE USERS...
                     WHERE                      -- THAT SATISFIES THE CONDITION...
                          ##S##=DISPLAYNAME     -- S EQUALS THE USERS' DISPLAY NAME

Answer 2

Python 3 + requests, 196 bytes

Thanks @Wondercricket for -6 bytes!

from requests import*
x=lambda s:all([print(a['user_id'])if s==a['display_name']else''for a in get('http://api.stackexchange.com/users?inname=%s&site=codegolf'%utils.quote(s)).json()['items']])and d

Uses Stack Exchange API. Fixed the Leaky N and Jorge errors.

If there are multiple users with the same name, it prints all of them, which is allowed.

Answer 3

Python 2 + requests, 187 bytes

from requests import*
def f(x):t=get("http://api.stackexchange.com/users?inname="+utils.quote(x)+"&site=codegolf").json()["items"];print[k['user_id']for k in t if k['display_name']==x][0]

Returns the user ID if a single user exists, the first user which matches the requirements if more exist, and reports an error otherwise.

Answer 4

JavaScript, 155 149 142 135 bytes

i=>fetch("//api.stackexchange.com/users?site=codegolf&inname="+i).then(r=>r.json()).then(r=>r.items.find(u=>u.display_name==i).user_id)

f=i=>fetch("//api.stackexchange.com/users?site=codegolf&inname="+i).then(r=>r.json()).then(r=>r.items.find(u=>u.display_name==i).user_id)

<input onchange="f(this.value).then(console.log)"><br>Fill input and press Enter

Answer 5

Python 2 + requests, 173 bytes

lambda s:[i['user_id']for i in get('http://api.stackexchange.com/users?inname=%s&site=codegolf'%utils.quote(s)).json()['items']if i['display_name']==s]
from requests import*

Sample run

>>> f=\
... lambda s:[i['user_id']for i in get('http://api.stackexchange.com/users?inname=%s&site=codegolf'%utils.quote(s)).json()['items']if i['display_name']==s]
>>> from requests import*
>>>
>>> tests = ['musicman523', 'Dennis', 'xnor', 'Leaky Nun', 'Community', 'Any user that does not exist', 'Alex', 'Leaky N', 'Jorge']
>>> for i in tests: print '%-30r -> %s'%(i, f(i))
... 
'musicman523'                  -> [69054]
'Dennis'                       -> [12012, 13891, 14912, 24937]
'xnor'                         -> [20260]
'Leaky Nun'                    -> [48934]
'Community'                    -> [-1]
'Any user that does not exist' -> []
'Alex'                         -> [21536, 69198, 11192]
'Leaky N'                      -> []
'Jorge'                        -> [3716]

Fun fact: the result is sorted by reputation, highest first.

Answer 6

JavaScript, 128 119 bytes

-9 bytes thanks to Rogem.

n=>fetch("198.252.206.16/users?site=codegolf&inname="+n).then(r=>r.text()).then(t=>t.match(`\\/([^\\/]*)\\/`+n+`"`)[1])

Answer 7

JavaScript (ES6) + HTML, 154 152 151 202 179 161 145 bytes

Sacrificed a few bytes to handle special characters.

Needs to be run under the api.stackexchange.com domain. Returns a Promise containing the ID or Throws an error in the Promise if the username can't be found.

s=>fetch(`/users?site=codegolf&inname=`+s).then(r=>r.json()).then(j=>j.items.find(i=>(o.innerHTML=i.display_name,o.innerText==s)).user_id)

<a id=o

Note: This solution was developed independently of Uriel's and its comments; if Uriel decides to use the find method, I'm happy to roll back to my longer, recursive version.