2,875
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Module:FunList: Difference between revisions
From Melvor Idle
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-- Private fields | -- Private fields | ||
local mytable = tbl | local mytable = tbl | ||
-- Private functions. | |||
local function getElementAtIndex(index) | |||
assert(tonumber(index)) | |||
local ix = tonumber(index) | |||
local i = 0 | |||
if ix >= 0 then | |||
for _, v in pairs(mytable) do | |||
i = i + 1 | |||
if i == ix then | |||
return true, v | |||
end | |||
end | |||
end | |||
return false, nil | |||
end | |||
-- Public functions | |||
-- Determines whether all elements of a sequence satisfy a condition. | -- Determines whether all elements of a sequence satisfy a condition. | ||
function funlist.all(predicate) | function funlist.all(predicate) | ||
| Line 63: | Line 81: | ||
end | end | ||
return count | return count | ||
end | |||
-- Returns the element at a specified index in a sequence. | |||
function funlist.itemAt(index) | |||
local found, item = getElementAtIndex(index) | |||
if found == true then | |||
return item | |||
end | |||
error('Index out of range') | |||
end | |||
-- Returns the element at a specified index in a sequence or a default value if the index is out of range. | |||
function funlist.itemAtOrDefault(index, defaultItem) | |||
local found, item = getElementAtIndex(index) | |||
if found == true then | |||
return item | |||
end | |||
return defaultItem | |||
end | |||
-- Returns the first element of a sequence. | |||
function funlist.first() | |||
for _, v in pairs(mytable) do | |||
return v | |||
end | |||
error('No items in sequence.') | |||
end | |||
-- Returns the first element of a sequence, or a default value if no element is found. | |||
function funlist.firstOrDefault(defaultItem) | |||
for _, v in pairs(mytable) do | |||
return v | |||
end | |||
return defaultItem | |||
end | |||
-- Returns the last element of a sequence. | |||
function funlist.last() | |||
if funlist.any() == false then | |||
error('Sequence contains no items.') | |||
end | |||
local last = nil | |||
for _, v in pairs(mytable) do | |||
last = v | |||
end | |||
return last | |||
end | |||
-- Returns the last element of a sequence, or a default value if no element is found. | |||
function funlist.lastOrDefault(defaultItem) | |||
if funlist.any() == false then | |||
return defaultItem | |||
end | |||
local last = nil | |||
for _, v in pairs(mytable) do | |||
last = v | |||
end | |||
return last | |||
end | end | ||
