Multidimensional arrays
Multidimensional arrays can be defined as:
var A = [
[1, 2],
[3, 4],
[5, 6],
[7, 8],
]
var B = [
[1, 2, 3],
[4, 5, 6],
]
In Sidef, we have the Array.wise_op() method, which takes two arbitrary nested arrays and an operator, folding each element (entrywise) with the provided operator, which is also available as a ~Wop b:
say ([1,2,[3,[4]]] ~W+ [42,43,[44,[45]]]) #=> [43, 45, [47, [49]]]
Alternatively:
say wise_op([1,2,[3,[4]]], '+', [42,43,[44,[45]]]) #=> [43, 45, [47, [49]]]
Scalar operations:
A `scalar_add` 42 # scalar addition (aliased as `sadd`)
A `scalar_sub` 42 # scalar subtraction (aliased as `ssub`)
A `scalar_mul` 42 # scalar multiplication (aliased as `smul`)
A `scalar_div` 42 # scalar division (aliased as `sdiv`)
This methods are provided by Array.scalar_op(), which, just like Array.wise_op(), also supports arbitrary nested arrays:
say ([1,2,[3,[4]]] ~S+ 42) #=> [43, 44, [45, [46]]]
say ([1,2,[3,[4]]] ~S* 42) #=> [42, 84, [126, [168]]]
...which is equivalent with:
say scalar_op([1,2,[3,[4]]], '+', 42) #=> [43, 44, [45, [46]]]
say scalar_op([1,2,[3,[4]]], '*', 42) #=> [42, 84, [126, [168]]]

Iteration over 2D arrays

The extended for-in loop provides support for iterating over a 2D-array, which is useful in combination with the cross and zip metaoperators:
for a,b in ([1,2] ~X [3,4]) {
say "#{a} #{b}"
}
This is equivalent with:
[[1,2], [3,4]].cartesian {|a,b|
say "#{a} #{b}"
}
and outputs:
1 3
1 4
2 3
2 4
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