Array manipulation functions

Content Author: The Mana World

This script provides various array manipulation functions, and more might be added in the future.
All of those functions (except the arithmetic ones) work with both integer and string arrays.

The start of the array is always implicitly index 0, unless an index is specified, ie @array[index]

array_pad(<array>, <size>, <value>)
pads the array left or right with <value> until it reaches <size> size. If <size> is negative it will pad left.
> returns the number of added entries

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_pad(.@foo, 8, 69); // => 3

// array is now: 1, 2, 3, 4, 5, 69, 69, 69

Code:

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_pad(.@foo, -8, 69); // => 3

// array is now: 69, 69, 69, 1, 2, 3, 4, 5

array_replace(<array>, <needle>, <replacement>{, <neq>})
finds every occurrence of <needle> within the array and replaces it with <replacement>. if <neq> is true, finds entries that do not match instead
> returns the number of changed entries

Code:

setarray(.@foo, 1, 1, 3, 1, 5); // initialize the array
array_replace(.@foo, 1, 69); // => 3

// array is now: 69, 69, 3, 69, 5

array_find(<array>, <needle>{, <neq>})
finds the first occurrence of <needle> within the array. if <neq> is true, finds entries that do not match instead
> returns the index, or if none is found returns -1

Code:

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_find(.@foo, 3); // => 2
array_find(.@foo, 1); // => 0
array_find(.@foo, 6); // => -1

array_rfind(<array>, <needle>{, <neq>})
like array_find, but finds the last occurrence. if <neq> is true, finds entries that do not match instead
> returns the index, or if none is found returns -1

Code:

setarray(.@foo, 1, 2, 3, 4, 3); // initialize the array
array_rfind(.@foo, 3); // => 4
array_rfind(.@foo, 4); // => 3
array_rfind(.@foo, 6); // => -1

array_exists(<array>, <needle>{, <neq>})
very similar to array_find() but it instead just checks if it exists or not. if <neq> is true, finds entries that do not match instead
> returns true or false

Code:

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_exists(.@foo, 3); // => true
array_exists(.@foo, 6); // => false

array_count(<array>, <needle>{, <neq>})
similar to array_find() but iterates through the whole array. if <neq> is true, finds entries that do not match instead
> returns the total number of occurrences of <needle>

Code:

setarray(.@foo, 1, 69, 3, 69, 5); // initialize the array
array_count(.@foo, 69); // => 2

array_entries(<array>)
a wrapper around array_count(). behaves similarly to getaraysize() but does not count holes
> returns the number of non-empty entries

Code:

setarray(.@foo, 1, 2, 0, 0, 5); // initialize the array
getarraysize(.@foo); // => 5
array_entries(.@foo); // => 3

array_remove(<array>, <needle>{, <neq>})
finds and removes every occurrence of <needle> from the array, while shifting left. if <neq> is true, finds entries that do not match instead
> returns the number of removed entries

Code:

setarray(.@foo, 1, 69, 3, 69, 5); // initialize the array
array_remove(.@foo, 69); // => 2

// array is now: 1, 3, 5

array_reverse(<array>)
reverses the array
> returns true

Code:

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_reverse(.@foo); // => true

// array is now: 5, 4, 3, 2, 1

array_sum(<array>)
iterates through the whole array to perform an arithmetic addition
> returns the sum of every entries of the array

Code:

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_sum(.@foo); // ((((1 + 2) + 3) + 4) + 5) => 15

array_difference(<array>)
iterates through the whole array to perform an arithmetic subtraction
> returns the difference of every entries of the array

Code:

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_difference(.@foo); // ((((1 - 2) - 3) - 4) - 5) => -13

array_product(<array>)
iterates through the whole array to perform an arithmetic multiplication
> returns the product of every entries of the array

Code:

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_product(.@foo); // ((((1 * 2) * 3) * 4) * 5) => 120

array_quotient(<array>)
iterates through the whole array to perform an arithmetic division
> returns the quotient of every entries of the array

Code:

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_quotient(.@foo); // ((((1 / 2) / 3) / 4) / 5) => 0

array_shift(<array>)
removes the first entry of the array, while shifting left
> returns the value of the removed entry

Code:

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_shift(.@foo); // => 1

// array is now: 2, 3, 4, 5

array_unshift(<array>, <value>)
adds <value> to the start of the array, while shifting right
> returns the new size of the array

Code:

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_unshift(.@foo, 69); // => 6

// array is now: 69, 1, 2, 3, 4, 5

array_pop(<array>)
removes the last entry of the array
> returns the value of the removed entry

Code:

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_pop(.@foo); // => 5

// array is now: 1, 2, 3, 4

array_push(<array>, <value>)
adds <value> to the end of the array
> returns the new size of the array

Code:

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_push(.@foo, 69); // => 6

// array is now: 1, 2, 3, 4, 5, 69

array_shuffle(<array>)
shuffles the array
> returns true

Code:

setarray(.@foo, 1, 2, 3, 4, 5); // initialize the array
array_shuffle(.@foo); // => true

// array is now: 1, 4, 2, 3, 5 (example, unpredictable)

array_unique(<array>{, <threshold>})
allows array entries to appear up to <threshold> times (1 by default) and removes the extraneous ones. useful to remove duplicate entries
> returns the number of removed entries

setarray(.@foo, 1, 3, 3, 4, 5); // initialize the array
array_unique(.@foo); // => 1

// array is now: 1, 3, 4, 5

array_diff(<base array>, <array>{, <array>...}, <result array>)
compares the base array against one or more other arrays and fills the result array with the entries in base array that are not present in any of the other arrays
> returns the number of entries not found in other arrays

setarray(.@base, 1, 2, 3, 4, 5, 6, 7, 8); // initialize the base array

// fill the arrays to compare with the base array:
setarray(.@foo, 2, 3, 4, 5, 6, 7, 8); // missing "1"
setarray(.@bar, 1, 2, 3, 4, 6, 7, 8); // missing "5"
setarray(.@baz, 1, 2, 3, 4, 5, 6, 7); // missing "8"

// compare foo, bar and baz against base, and fill result:
array_diff(.@base, .@foo, .@bar, .@baz, .@result); // => 3

// .@result is now: 1, 5, 8

array_filter(<array>, "<function>")
filters the array using a function that is tested against every entries. if the function returns false, the relevant entry is removed and the array is shifted left
> returns the number of removed entries

function script is_prime {
if (getarg(0) <= 1)
return false;

for (.@i = 2; .@i <= getarg(0) / 2; ++.@i)
if ((getarg(0) % .@i) == 0)
return false;

return true;
}

setarray(.@foo, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15);
array_filter(.@foo, "is_prime"); // => 9

// array is now: 2, 3, 5, 7, 11, 13

array_sort(<array>)
sorts the array in ascending order
> returns true

setarray(.@foo, 2, 1, 8, 4, 5, 7, 6, 3); // initialize the array
array_sort(.@foo); // => true

// array is now: 1, 2, 3, 4, 5, 6, 7, 8

array_rsort(<array>)
sorts the array in descending order
> returns true

setarray(.@foo, 2, 1, 8, 4, 5, 7, 6, 3); // initialize the array
array_rsort(.@foo); // => true

// array is now: 8, 7, 6, 5, 4, 3, 2, 1

Requires Hercules of June 24 2017 or newer version
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This script was made by me, for The Mana World + Evol.
License: public domain (CC0)

Reactions: Patskie, bWolfie, Arduino and 2 others

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