Lambda Mode
Properties
The “lambda” mode plays a major part in the design of complex programs, and is used in various configurations. Boxes on “lambda” mode return functions. Hence, a box on “lambda” mode doesn’t perform a calculation and yields a result, but will yield itself as a function when the evaluation takes place.
The om+ box doesn’t return the result of an addition, but an “anonymous” function.
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Procedure
To set a box on “lambda” mode, select it, press b and click twice on the
upper left cross. A small λ letter 
icon
appears.
Use
Higher Order Functions and Functional Arguments
Some functions wait for arguments that are not as simple as numbers or lists. In particular, higher-order functions are functions whose arguments are functions themselves , or which return functions as resulting values.
To be used as a functional argument, a box must be set on “lambda” mode. It is then called a “lambda function”.
Higher-Order Programming in OM
Example
For instance, apply is a higher-order Lisp function that applies a functional argument, which must be a function, to a second argument, which must be a list containing the arguments to pass to the function. Here, apply applies + to a list of numbers.
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