MapLookupΒΆ
MapLookup uses a hashing algorithm to quickly find the map element with a key that exactly matches the given key.
-
data = MapLookup(hMap, ssKey) -
data = MapLookup(hMap, ssKey, default_value)
Return Value
data is a real, complex or string matrix. In case of an error the function returns 0.
Parameters
-
hMap hMap Identifies the map.
-
ssKey ssKey specifies the key that identifies the element to be looked up.
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default_value The function returns the value default_value, if the key ssKey does not exist in the map . default_value can be a real, complex or string matrix.
Comment
To check if the return value is valid the ObjGetOk can be used. If the key does not exist in the map ObjGetOk returns FALSE (0).
Example
hMap = MapCreate();
MapSetAt(hMap, "Test1", [1,2,3,4,5,6]);
MapSetAt(hMap, "Test2", [2,5,7,6,3,1,6,7,8]);
MapSetAt(hMap, "Header1", ["1,5l", "4 Valves"]);
if (MapKeyExists(hMap, "Test2") {
rmStr = MapLookup(hMap, "Test2");
} else
// set to default:
rmStr = [2,5,7,6,3,1,6,7,8];
}
// or
rmStr = MapLookup(hMap, "Test1", [2,5,7,6,3,1,6,7,8])
History
| Version | Description |
|---|---|
| 5.7.0 | New parameter default_value added. |
| 4.2.0 | The function can return 8-bit clean strings (may contain 0-characters). |
See also
id-2108427