Skip to content

Instantly share code, notes, and snippets.

@akostadinov
Created January 26, 2021 11:59
  • Star 0 You must be signed in to star a gist
  • Fork 0 You must be signed in to fork a gist
Star You must be signed in to star a gist
Save akostadinov/4ba7828e8e1a537c89cece28a7c9c2cb to your computer and use it in GitHub Desktop.
Pretty print JSON-like exercise
INDENT_SIZE = 2
def pretty_jsonify(struct, indent=0)
case struct
when Array
"[\n" + indent_str("", indent+INDENT_SIZE) +
struct.map { |value|
pretty_jsonify(value, indent+INDENT_SIZE)
}.join(",\n#{indent_str('', indent+INDENT_SIZE)}") +
"\n" + indent_str("]", indent)
when Hash
"{\n" + indent_str("", indent+INDENT_SIZE) +
struct.map { |key, value|
pretty_jsonify(key, indent+INDENT_SIZE) + ": " + pretty_jsonify(value, indent+INDENT_SIZE)
}.join(",\n#{indent_str('', indent+INDENT_SIZE)}") +
"\n" + indent_str("}", indent)
when nil
"null"
when Numeric
"#{struct}"
when TrueClass
"true"
when FalseClass
"false"
else
"\"#{struct}\""
end
end
def indent_str(str, indent)
" "*indent + str
end
cases = [
{
i: 'foo',
o: '"foo"'
},
{
i: 1,
o: '1'
},
{
i: 1.5,
o: '1.5'
},
{
i: true,
o: 'true'
},
{
i: nil,
o: 'null'
},
{
i: { foo: 'bar', baz: 'buzz' },
o: %Q#{\n "foo": "bar",\n "baz": "buzz"\n}#
},
{
i: ['a', 'b', 'c'],
o: %Q#[\n "a",\n "b",\n "c"\n]#
},
{
i: { foo: 'bar', baz: { fizz: 'buzz', waz: 1 }, wiz: [ 2, { fuzz: true }, nil, [ 'a', 'b' ] ] },
o: %Q{{\n "foo": "bar",\n "baz": {\n "fizz": "buzz",\n "waz": 1\n },\n "wiz": [\n 2,\n {\n "fuzz": true\n },\n null,\n [\n "a",\n "b"\n ]\n ]\n}}
}
]
cases.each_with_index { |c, idx|
if pretty_jsonify(c[:i]) == c[:o]
puts "Test case #{idx} PASSED:\n#{c[:o]}"
else
puts "Test case #{idx} FAILED:\n#{pretty_jsonify(c[:i])}\nvs\n#{c[:o]}"
end
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment