lookup

The lookup method returns the value at the specified path in the JSON array.

NOTE:

This method does not make a copy of the value, so modifying the returned value affects the original array.

Syntax

lookup( pathElements )

Arguments

Argument Description
pathElements (json_path_string_or_integer) The path of the value to return. Specify one or more path elements, which might be object attribute names (strings) or array indexes (integers).

Returns

(LuaJsonValue) Returns the value that exists at the specified path, or nil if the specified path does not exist.

Example

The following example demonstrates how to obtain a value:

local myJsonObject = LuaJsonObject:new( { product="IDOL" , version=11 } )
local myJsonArray = LuaJsonArray:new(0, 1, 2, myJsonObject)
local myValue = myJsonArray:lookup(3, "product")
print (myValue:value())
-- IDOL

The following example demonstrates how modifying a returned value affects the original array:

local myJsonObject = LuaJsonObject:new()
myJsonObject:assign("name", LuaJsonArray:new("value1"))

local myJsonArray = myJsonObject:lookup("name"):array()
myJsonArray:append("value2")

print (myJsonObject:string())
-- {"name":["value1","value2"]}

See Also


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