What is the prepend() function in Euphoria?
Overview
A sequence is a very important data type in Euphoria. The variables of the sequence data type have their values enclosed inside curly braces {} or inside double quotation marks "".
We can perform operations on elements of a sequence. These elements are indexed. However, the index starts from 1 instead of zero.
The prepend() function
The prepend() function is used to add elements at the beginning of a sequence.
This function includes the specified value at the start of a sequence. This means that this new element now takes the index 1.
Syntax
prepend(sequence,newitem)
Parameter
- The first parameter,
sequence, is the sequence to which we’re going to add an item. It can be any sequence oflength >= 0. - The second parameter,
newitem, is the new element that we’re going to add to the sequence. This can be anatomor even anothersequence.
Return value
This function returns a sequence with a length greater than the original sequence.
Example
--declare some sequence variablessequence prependedTo, toBeAddedTo--define an atom variableatom scores = 5toBeAddedTo = {6,7,8}prependedTo = prepend(toBeAddedTo,scores)print(1,prependedTo)
Explanation
-
Line 3: We declare two sequence variables,
toBeAddedToandprependedTo. ThetoBeAddedTovariable has the sequence to which we want to add add an item.prependedTohas the return value of theprepend()function. -
Line 6: We define an atom
scores. This is later on prepended to the sequence. -
Line 10: We call the
prepend()function and save its return value in the variableprependedTo. -
Line 12: We print the return value of the variable
prependedTo.
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NDUKWE CHIDERA K.