Vb.net – Join arrays in VB.NET

.net-3.5arraysvb.net

What's the simplest way to join one or more arrays (or ArrayLists) in Visual Basic?

I'm using .NET 3.5, if that matters much.

Best Answer

This is in C#, but surely you can figure it out...

int[] a = new int[] { 1, 2, 3, 4, 5 };
int[] b = new int[] { 6, 7, 8, 9, 10 };
int[] c = a.Union(b).ToArray();

It will be more efficient if instead of calling "ToArray" after the union, if you use the IEnumerable given instead.

int[] a = new int[] { 1, 2, 3, 4, 5 };
int[] b = new int[] { 6, 7, 8, 9, 10 };
IEnumerable<int> c = a.Union(b);

Related Solutions

Java – How to concatenate two arrays in Java

I found a one-line solution from the good old Apache Commons Lang library.
ArrayUtils.addAll(T[], T...)

Code:

String[] both = ArrayUtils.addAll(first, second);

With arrays, why is it the case that a[5] == 5[a]

The C standard defines the [] operator as follows:

a[b] == *(a + b)

Therefore a[5] will evaluate to:

*(a + 5)

and 5[a] will evaluate to:

*(5 + a)

a is a pointer to the first element of the array. a[5] is the value that's 5 elements further from a, which is the same as *(a + 5), and from elementary school math we know those are equal (addition is commutative).

Best Answer

Related Solutions

Java – How to concatenate two arrays in Java

With arrays, why is it the case that a[5] == 5[a]

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