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Swift Associative Arrays

By default, array keys are integers. However, other primitive types are also allowed as array keys. The syntax for declaring an
array with a key type different than the default is:

<valueType>[<keyType>] array;

For example, the following code declares and assigns items to an array with string keys and float values:

float[string] a;
a["one"] = 0.2;
a["two"] = 0.4;

In addition to primitive types, a special type named auto can be used to declare an array for which an additional append operation
is available:

int[auto] array;
foreach i in [1:100] {
array << (i*2) ;
foreach v in array {

Items in an array with auto keys cannot be accessed directly using a primitive type. The following example results in a compiletime error:

int[auto] array;
array[0] = 1;

However, it is possible to use auto key values from one array to access another:

int[auto] a;
int[auto] b;
a << 1;
a << 2;
foreach v, k in a {
b[k] = a[k] * 2;


In this page (written and validated by ) you learned about Swift Associative Arrays . What's Next? If you are interested in completing Swift tutorial, your next topic will be learning about: Swift Ordering of execution.

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