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Hash join: Difference between revisions
Add Swift
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(Add Swift) |
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18 Alan Zombies
28 Glory Buffy</pre>
=={{header|Swift}}==
{{trans|Rust}}
<lang swift>func hashJoin<A, B, K: Hashable>(_ first: [(K, A)], _ second: [(K, B)]) -> [(A, K, B)] {
var map = [K: [B]]()
for (key, val) in second {
map[key, default: []].append(val)
}
var res = [(A, K, B)]()
for (key, val) in first {
guard let vals = map[key] else {
continue
}
res += vals.map({ (val, key, $0) })
}
return res
}
let t1 = [
("Jonah", 27),
("Alan", 18),
("Glory", 28),
("Popeye", 18),
("Alan", 28)
]
let t2 = [
("Jonah", "Whales"),
("Jonah", "Spiders"),
("Alan", "Ghosts"),
("Alan", "Zombies"),
("Glory", "Buffy")
]
print("Age | Character Name | Nemesis")
print("----|----------------|--------")
for (age, name, nemesis) in hashJoin(t1, t2) {
print("\(age) | \(name) | \(nemesis)")
}</lang>
{{out}}
<pre>Age | Character Name | Nemesis
----|----------------|--------
27 | Jonah | Whales
27 | Jonah | Spiders
18 | Alan | Ghosts
18 | Alan | Zombies
28 | Glory | Buffy
28 | Alan | Ghosts
28 | Alan | Zombies</pre>
=={{header|Tcl}}==
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