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37 lines
937 B
Text
37 lines
937 B
Text
local jecs = require("@jecs")
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local pair = jecs.pair
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local world = jecs.World.new()
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local Name = world:component()
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local function named(ctr, name)
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local e = ctr(world)
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world:set(e, Name, name)
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return e
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end
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local function name(e)
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return world:get(e, Name)
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end
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local Eats = world:component()
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local Apples = named(world.entity, "Apples")
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local Oranges = named(world.entity, "Oranges")
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local bob = named(world.entity, "Bob")
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world:set(bob, pair(Eats, Apples), 10)
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local alice = named(world.entity, "Alice")
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world:set(alice, pair(Eats, Oranges), 5)
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-- Aliasing the wildcard to symbols improves readability and ease of writing
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local __ = jecs.Wildcard
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-- Create a query that matches edible components
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for entity, amount in world:query(pair(Eats, __)) do
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-- Iterate the query
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local food = world:target(entity, Eats)
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print(`{name(entity)} eats {amount} {name(food)}`)
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end
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-- Output:
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-- Alice eats 5 Oranges
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-- Bob eats 10 Apples
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