Synopsis
Delete a key from an Associative Array
Usage
assoc_delete_key (Assoc_Type a, String_Type k)
Description
The assoc_delete_key function deletes a key given by k
from the associative array a . If the specified key does not
exist in a , then this function has no effect.
See also
Synopsis
Return all the key names of an Associative Array
Usage
String_Type[] assoc_get_keys (Assoc_Type a)
Description
This function returns all the key names of an associative array
a as an ordinary one dimensional array of strings. If the
associative array contains no keys, an empty array will be returned.
Example
The following function computes the number of keys in an associative
array:
define get_num_elements (a)
{
return length (assoc_get_keys (a));
}
See also
Synopsis
Return all the values of an Associative Array
Usage
Array_Type assoc_get_keys (Assoc_Type a)
Description
This function returns all the values in the associative array
a as an array of proper type. If the associative array
contains no keys, an empty array will be returned.
Example
Suppose that
a is an associative array of type
Integer_Type , i.e., it was created via
variable a = Assoc_Type[Integer_Type];
The the following may be used to print the values of the array in
ascending order:
static define int_sort_fun (x, y)
{
return sign (x - y);
}
define sort_and_print_values (a)
{
variable i, v;
v = assoc_get_values (a);
i = array_sort (v, &int_sort_fun);
v = v[i];
foreach (v)
{
variable vi = ();
() = fprintf (stdout, "%d\n", vi);
}
}
See also
Synopsis
Check to see whether a key exists in an Associative Array
Usage
Integer_Type assoc_key_exists (Assoc_Type a, String_Type k)
Description
The assoc_key_exists function may be used to determine whether
or not a specified key k exists in an associative array a .
It returns 1 if the key exists, or 0 if it does not.
See also