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Closed 11 years ago.
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What's the difference between parse tree and AST?
I need to know what is the difference between abstract parse trees and parse trees.
From wikipedia:
Parse trees are distinct from abstract syntax trees (also known simply as syntax trees), in that their structure and elements more concretely reflect the syntax of the input language.
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MongoDB: How to query over a json string?
(1 answer)
Using stored JavaScript functions in the Aggregation pipeline, MapReduce or runCommand
(1 answer)
Closed 3 years ago.
In the context of metabase:
I am applying the following one-liner query to extract a particular field from a collection of mongodb documents:
[{"$project":{"myName":"$field1.field2" }},
{"$match":{"_id":{"$eq":"blah"}}} ]
myName is a string field that is in fact a serialized JSON object.
How can I adapt the pipeline above, perhaps using JSON.parse(), to pull out fields nested further down the JSON hierarchy?
Part II: How would I add a final step to extract some of those deeply nested fields? The situation is further complicated because the document structure is not consistent between documents...
Thanks!
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pretty-print JSON using JavaScript
(31 answers)
Closed 5 years ago.
I am storing some query in json file. the query is little bit lengthy. I want to store these query in multiple lines to show query clearly. In C# when we have like this query we put in the front of query # .. Is there any special key to put in the front of json string?
below is image what I mean by this.
No, there is no way to do this; newlines are not allowed in JSON strings [1].
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How to document dynamic query parameter names in OpenAPI (Swagger)?
(2 answers)
Closed 3 years ago.
I have the scenario where an endpoint can accept 'N' number of query parameters with a non-predetermined name and value i.e. I have no idea what query parameters someone might pass in e.g.
?i=can&pass=anything&in=here
How would I describe the above using the Swagger specification?
Looks like it's not supported in the version 2.0 of the OpenAPI specification, but it may be addressed in future versions.
This issue and this pull request can give you more details.
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What is the minimum valid JSON?
(8 answers)
Closed 6 years ago.
Looking at json spec, I'm not sure whether a value is permitted to stand alone, or is only permitted as part of object or array structure.
This is valid JSON:
[123]
But is this valid JSON:
123
Per ECMA-404, The JSON Data Interchange Standard (pdf), which is linked from the JSON.org page you linked:
A JSON text is a sequence of tokens formed from Unicode code points that conforms to the JSON value grammar.
And:
A JSON value can be an object, array, number, string, true, false, or null.
As such, the value 123 is valid JSON, representing an integer.
A value is permitted to stand alone.
The rule has been changed a few years ago.
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I read in the EcmaScript specification that certain methods are "generic". What does this mean?
(2 answers)
Closed 7 years ago.
What is the meaning of this? This is regarding the Array.prototype.concat method, but it's stated throughout the spec, again and again, for a series of methods.
The concat function is intentionally generic; it does not require that
its this value be an Array object. Therefore it can be transferred to
other kinds of objects for use as a method. Whether the concat
function can be applied successfully to a host object is
implementation-dependent.
Can you explain this in simple wording, perhaps providing an example as well?
It means that you can apply the method to an array-like object even if it's not an Array. These include NodeLists and the arguments object.
I sometimes use this feature to turn the arguments object into an array: [].slice.call(arguments) returns the argument list as an Array object, giving me native access to all the array methods.
You can read about this on MDN.