Apply a callback to an array: Difference between revisions
Jakt
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But note that this is a trivial example since <code>*: 1 2 3 4 5</code> would get the same result. Then again, this is something of a trivial exercise in J since all of J is designed around the idea of applying functions usefully to arrays.
=={{header|Jakt}}==
<syntaxhighlight lang="jakt">
fn map<T, U>(anon array: [T], function: fn(anon x: T) -> U) throws -> [U] {
mut result: [U] = []
result.ensure_capacity(array.size())
for item in array {
result.push(value: function(item))
}
return result
}
fn main() {
let array = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]
let array_squared = map(array, function: fn(anon n: i64) => n * n)
println("{}", array_squared)
}
</syntaxhighlight>
{{out}}
<pre>
[1, 4, 9, 16, 25, 36, 49, 64, 81, 100]
</pre>
=={{header|Java}}==
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