Choose unfinished objectives

v3 · Activity 5 of 5 · loops-and-conditions · filtering · 11 min Runs here

Chapter outline

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Mini-mission

A loop visits each objective; an if decides whether that objective belongs in the result. Filtering does not require changing the source sequence.

Start with an empty result and append only unfinished names. Returning the result after the loop handles a fully completed quest as an empty sequence.

Your task

remainingObjectives(objectives) returns names for complete=false entries in their original order. The starter selects the wrong state. Keep the final return shown in the starter so the checker can call or inspect your result.

Interface: remainingObjectives(objectives:{{name:string,complete:boolean}}) -> {string}

Input	Expected
Mixed quest`{ { name = "Lamp", complete = true }, { name = "Gate", complete = false }, { name = "Bench", complete = false } }`	`{ "Gate", "Bench" }`
All complete`{ { name = "Lamp", complete = true } }`	`{}`

See another example

local tasks = { {name="Light lamp", complete=true}, {name="Open door", complete=false} }
local remaining = {}
for _, task in ipairs(tasks) do
    if not task.complete then table.insert(remaining, task.name) end
end
return remaining

The completed lamp task is skipped; the unfinished door task is appended.

Syntax in this activity

New syntax: if inside a loop

Earlier ideas used here

iteration
dictionaries
if-else
table-insert

Explain more

A loop visits each objective; an if decides whether that objective belongs in the result. Filtering does not require changing the source sequence.

Start with an empty result and append only unfinished names. Returning the result after the loop handles a fully completed quest as an empty sequence.

A boolean complete field describes state. Check not objective.complete to select unfinished work. For this lesson every objective supplies a boolean; missing-data policies come next.

Explain this code

Select a word or symbol in this authored example. Your editor draft stays unchanged.

  remainingObjectivesobjectives
     result  
     _, objective in objectives 
         objective.complete  table.insertresult, objective.name 
    
     result

 remainingObjectives

Choose a highlighted part to see what it means.

Free experiment

This is a private experiment copy. It does not replace your answer or complete the activity.

These inputs apply when your scratchpad returns the function described by the activity interface.

Test different inputs

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local tasks = { {name="Light lamp", complete=true}, {name="Open door", complete=false} }
local remaining = {}
for _, task in ipairs(tasks) do
    if not task.complete then table.insert(remaining, task.name) end
end
return remaining

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Experiment Output

Your output will appear here.

Reset starter

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Code

Luau

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local function remainingObjectives(objectives)
    local result = {}
    for _, objective in ipairs(objectives) do
        if objective.complete then table.insert(result, objective.name) end
    end
    return result
end
return remainingObjectives

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Your output will appear here.

Ready

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Your task

Interface: remainingObjectives(objectives:{{name:string,complete:boolean}}) -> {string}

Input	Expected
Mixed quest`{ { name = "Lamp", complete = true }, { name = "Gate", complete = false }, { name = "Bench", complete = false } }`	`{ "Gate", "Bench" }`
All complete`{ { name = "Lamp", complete = true } }`	`{}`

See another example

local tasks = { {name="Light lamp", complete=true}, {name="Open door", complete=false} }
local remaining = {}
for _, task in ipairs(tasks) do
    if not task.complete then table.insert(remaining, task.name) end
end
return remaining

The completed lamp task is skipped; the unfinished door task is appended.

Syntax in this activity

New syntax: if inside a loop

Earlier ideas used here

iteration
dictionaries
if-else
table-insert

Explain more

A loop visits each objective; an if decides whether that objective belongs in the result. Filtering does not require changing the source sequence.

Start with an empty result and append only unfinished names. Returning the result after the loop handles a fully completed quest as an empty sequence.

A boolean complete field describes state. Check not objective.complete to select unfinished work. For this lesson every objective supplies a boolean; missing-data policies come next.

Explain this code

Select a word or symbol in this authored example. Your editor draft stays unchanged.

  remainingObjectivesobjectives
     result  
     _, objective in objectives 
         objective.complete  table.insertresult, objective.name 
    
     result

 remainingObjectives

Choose a highlighted part to see what it means.

Free experiment

This is a private experiment copy. It does not replace your answer or complete the activity.

These inputs apply when your scratchpad returns the function described by the activity interface.

Test different inputs

Font size Plain text

local tasks = { {name="Light lamp", complete=true}, {name="Open door", complete=false} }
local remaining = {}
for _, task in ipairs(tasks) do
    if not task.complete then table.insert(remaining, task.name) end
end
return remaining

Luau keyword highlighting · Ctrl/⌘ + Enter: Run · Esc: leave editorTab inserts indentation

Experiment Output

Your output will appear here.

local function remainingObjectives(objectives) local result = {} for _, objective in ipairs(objectives) do if objective.complete then table.insert(result, objective.name) end end return result end return remainingObjectives