JSON
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You are encouraged to solve this task according to the task description, using any language you may know.
Load a JSON string into a data structure. Also create a new data structure and serialize it into JSON. Use objects and arrays, and make sure your JSON is valid (http://www.jsonlint.com/).
Go
<lang go>package main import "json" import "fmt"
func main() {
var data map[string]interface{} json.Unmarshal([]byte("{ \"foo\": 1, \"bar\": [10, \"apples\"] }"), &data) fmt.Println(data)
sample := map[string]interface{}{ "blue": []interface{}{1,2}, "ocean": "water" } json_string, err := json.Marshal(sample) if err == nil { fmt.Println(string(json_string)) } else { fmt.Println(err) }
}</lang>
JavaScript
Requires JSON library, now present in some browsers. <lang JavaScript>var data = JSON.parse('{ "foo": 1, "bar": [10, "apples"] }');
var sample = { "blue": [1,2], "ocean": "water" }; var json_string = JSON.stringify(sample);</lang>
Of course, it IS called JavaScript Object Notation, so it is a JavaScript object literal, and you can, alternately, parse it by just eval'ing it. This should work in any browser without a library. (Eval may be dangerous, depending on the source of the data.) However, there is an ambiguity with parsing JavaScript object literals by themselves, where it might be mistakenly interpreted as a block, and the key followed by a colon as a label. To avoid this, remember to surround it in parentheses to force it to be interpreted as an expression: <lang javascript>var data = eval('(' + '{ "foo": 1, "bar": [10, "apples"] }' + ')');</lang>
Oz
With the JSON library from here: <lang oz>declare
[JSON] = {Module.link ['JSON.ozf']}
{System.show {JSON.decode "{ \"foo\": 1, \"bar\": [10, \"apples\"] }"}}
Sample = object(blue:array(1 2) ocean:"water") {System.showInfo {JSON.encode Sample}}</lang>
Output:
object(bar:array(10 [97 112 112 108 101 115]) foo:1) {"blue":[1,2],"ocean":"water"}
PHP
<lang php><?php $data = json_decode('{ "foo": 1, "bar": [10, "apples"] }'); // dictionaries will be returned as objects $data2 = json_decode('{ "foo": 1, "bar": [10, "apples"] }', true); // dictionaries will be returned as arrays
$sample = array( "blue" => array(1,2), "ocean" => "water" ); $json_string = json_encode($sample); ?></lang>
PicoLisp
PicoLisp has no JSON library, but it is easy enough to write one: <lang PicoLisp>(de checkJson (X Item)
(unless (= X Item) (quit "Bad JSON" Item) ) )
(de readJson ()
(case (read "_") ("{" (make (for (X (readJson) T (readJson)) (checkJson ":" (readJson)) (link (cons X (readJson))) (T (= "}" (setq X (readJson)))) (checkJson "," X) ) ) ) ("[" (make (link T) # Array marker (for (X (readJson) T (readJson)) (link X) (T (= "]" (setq X (readJson)))) (checkJson "," X) ) ) ) (T @) ) )
(de printJson (Item) # For simplicity, without indentation
(cond ((atom Item) (print Item)) ((=T (car Item)) (prin "[") (map '((X) (printJson (car X)) (and (cdr X) (prin ", ")) ) (cdr Item) ) (prin "]") ) (T (prin "{") (map '((X) (print (caar X)) (prin ": ") (printJson (cdar X)) (and (cdr X) (prin ", ")) ) Item ) (prin "}") ) ) )</lang>
This reads/prints JSON from/to files, pipes, sockets etc. To read from a string, a pipe can be used:
: (pipe (prinl "{ \"foo\": 1, \"bar\": [10, \"apples\"] }") (readJson) ) -> (("foo" . 1) ("bar" T 10 "apples")) : (printJson (quote ("name" . "Smith") ("age" . 25) ("address" ("street" . "21 2nd Street") ("city" . "New York") ("state" . "NY") ("zip" . "10021") ) ("phone" T "212 555-1234" "646 555-4567") ) ) {"name": "Smith", "age": 25, ... {"street": ... "phone": ["212 555-1234", ...
Python
<lang Python>import json data = json.loads('{ "foo": 1, "bar": [10, "apples"] }')
sample = { "blue": [1,2], "ocean": "water" } json_string = json.dumps(sample)</lang>