RosettaCodeData/Task/URL-encoding/Jq/url-encoding-2.jq

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def url_encode:
# The helper function checks whether the input corresponds to one of the characters: !'()*
def recode: . as $c | [33,39,40,41,42] | index($c);
def hex: if . < 10 then 48 + . else 55 + . end;
@uri
| explode
# 37 ==> "%", 50 ==> "2"
| map( if recode then (37, 50, ((. - 32) | hex)) else . end )
| implode;