lookup

Find value in dictionary by key.

Syntax

• value = lookup(d, key)
• value = lookup(d, key, 'FallbackValue', fallback)

Input argument

• d - scalar: dictionary object.
• key - key type must match or be convertible to the data type of keys in d.
• fallback - scalar: Fallback value

Output argument

• value - value.

Description

value = lookup(d, key) retrieves the value associated with the given key in dictionary d.

If the key does not exist, an error is raised.

value = lookup(d, key) is equivalent to value = d[key].

value = lookup(d, key, 'FallbackValue', fallback) specifies a fallback value to return if the key is not found in d.

lookup function only validates the fallback if it is needed. An error is raised only if the key is not found and no valid fallback is provided.

Example

names = ["Apple" "Banana" "Kiwi"];
wheels = [1 2 3];
d = dictionary(wheels, names)
v = lookup(d,[3,5], 'FallbackValue', "Orange")

See also

dictionary, remove, insert.

History

Author

Allan CORNET