What is the mapping() method in Euphoria?

What is the mapping() method?

The mapping() method is an inbuilt method in Euphoria. It sets the values found in a set A that are the same as those found in another set B to those in a final set C.

For example, if A is COUGH, B is CHo, and C is chy, then the mapping() method will give the output cOUGh. That is how this method works.

Syntax

mapping(source_arg,from_set,to_set,level)

When elements from source_arg are found in from_set, it is changed to a matching element of to_set.

Parameter values

  • source_arg: This is the Euphoria object variable that will be changed/mapped.

  • from_set: This is a sequence of objects that contains items from the source that will be changed. These items are the ones that are actually transformed.

  • to_set: These are the changed forms of items from the source_args variable, which are found in the from_set.

  • level: This is an integer value parameter, which can be a 0 (the default) or 1. If the integer value is 0, then it implies that mapping will be done to every atom in every level of the sub-sequences. And if the integer value is 1, the mapping will only apply to the items at the first level in source_arg.

Return value

The mapping() function returns an object value that is a mapped form of the source_arg variable.

The image given below is a pictorial explanation of all that’s been said so far:

Pictorial representation of how the mapping() method works

include std/sequence.e
printf(1,"%s", {mapping("COUGH", "CHo", "chy")})
printf(1, "\n%s", {mapping("Educative  Edpresso", "presso", "PRESS")})
printf(1, "\n%s", mapping({"my name is pinky","Hello pinky"}, "yak", "YAK"))

Explanation

  • Line 2: We import the relevant modules.
  • Lines 3–5: We use the mapping() method and print the output to the screen.

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