Type detection: Difference between revisions
→{{header|jq}}
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console.log(typeof(12345)); // Returns number
</pre>
=={{header|jq}}==
In jq, the function that returns the JSON type of a JSON entity is
<code>type/0</code>. It returns "object", "array", "boolean", "string", or "number".
Given arbitrary UTF-8 input, it could be used like so:
try type catch "invalid JSON"
Given some text of unknown type, a "typeof" function could be
written to determine whether the string could be interpreted as a
JSON document, and if so, what JSON type it would have, as follows:
def typeof:
try (fromjson | type) catch "string" ;
Here is an illustrative transcript from an interactive session showing input and output on alternate lines:
<pre>
$ jq -R 'try (fromjson | type) catch "string"'
abc
"string"
{"a":1,"b":2}
"object"
[1,"a"]
"array"
</pre>
=={{header|Julia}}==
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