What is pattern matching in SML?
Patterns are tested in the order in which they are written; the result of the case statement is the value of the expression corresponding to the first pattern that matches. When performing pattern matching in a case expression, SML has the ability to check whether the cases that have been listed are exhaustive or not.
What is SML code?
Standard ML (SML) is a general-purpose modular functional programming language with compile-time type checking and type inference. It is distinctive among widely used languages in that it has a formal specification, given as typing rules and operational semantics in The Definition of Standard ML.
How does map work in SML?
The map function takes a function F and a list [a1,a2,…,an], and produces the list [F(a1), F(a2),…, F(an)]. That is, it applies F to each element of the list and returns the list of resulting values.
How do I create a list in SML?
To create a list, you simply list all the values in brackets separated by commas. For example, I can have a list of integers. A list is similar to an array and it even must contain all values of the same type.
WHAT IS A in SML?
1. 18. A plain type variable like ‘a can be substituted with an arbitrary type. The form ”a is a so-called equality type variable, which means that it can only be substituted by types that admit the use of the equality operator = (or <> ) on their values.
How do you comment in SML?
Standard ML lacks line comments. This RFC recommends that line comments begin with ‘#’ preceded and followed by whitespace (where both newline and (start|end)-of-file are interpreted as whitespace) and end, of course, with #”\n”.
What is SML written in?
Aside from its runtime system, which is written in C, SML/NJ is written in Standard ML. It was originally developed jointly by Bell Laboratories and Princeton University.
Where is SML used?
The SML is frequently used in comparing two similar securities that offer approximately the same return, in order to determine which of them involves the least amount of inherent market risk relative to the expected return.
What is reduce in SML?
Reduce operates on a list of values to collapse or combine those values into a single value (or more generally a smaller number of values), again by applying the same computation to each value.
How do I test my SML code?
To test ML functions, go to the sml window. Enter the command use “filename. sml”; to load and compile the file you’ve just edited. You can interactively test each function as you add it.
What is a list in SML?
Lists in SML are therefore homogeneous lists, as opposed to heterogeneous lists in which each element can have a different type. Lists are immutable: you cannot change the elements of a list, unlike an array in Java.
What is SML unit?
() : unit is a trivial placeholder value returned from things that are side-effect based. It’s more obvious when you enter something that’s more commonly an expression at the prompt, e.g… – 2 * 7; val it = 14 : int.