Project translation

Author: Heromyth

target/aa.cozum.d

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+Ddoc
+
+$(COZUM_BOLUMU Associative Arrays)
+
+$(OL
+
+$(LI
+
+$(UL
+
+$(LI
+The $(C .keys) property returns a slice (i.e. dynamic array) that includes all of the keys of the associative array. Iterating over this slice and removing the element for each key by calling $(C .remove) would result in an empty associative array:
+
+---
+import std.stdio;
+
+void main() {
+    string[int] names =
+    [
+        1   : "one",
+        10  : "ten",
+        100 : "hundred",
+    ];
+
+    writeln("Initial length: ", names.length);
+
+    int[] keys = names.keys;
+
+    /* 'foreach' is similar but superior to 'for'. We will
+     * see the 'foreach' loop in the next chapter. */
+    foreach (key; keys) {
+        writefln("Removing the element %s", key);
+        names.remove(key);
+    }
+
+    writeln("Final length: ", names.length);
+}
+---
+
+$(P
+That solution may be slow especially for large arrays. The following methods would empty the array in a single step.
+)
+
+)
+
+$(LI
+Another solution is to assign an empty array:
+
+---
+    string[int] emptyAA;
+    names = emptyAA;
+---
+
+)
+
+$(LI
+Since the initial value of an array is an empty array anyway, the following technique would achieve the same result:
+
+---
+    names = names.init;
+---
+
+)
+
+)
+
+)
+
+$(LI
+The goal is to store multiple grades per student. Since multiple grades can be stored in a dynamic array, an associative array that maps from $(C string) to $(C int[]) would work here. The grades can be appended to the dynamic arrays that are stored in the associative array:
+
+---
+import std.stdio;
+
+void main() {
+    /* The key type of this associative array is string and
+     * the value type is int[], i.e. an array of ints. The
+     * associative array is being defined with an extra
+     * space in between to help distinguish the value type: */
+    int[] [string] grades;
+
+    /* The array of ints that correspond to "emre" is being
+     * used for appending the new grade to that array: */
+    grades["emre"] ~= 90;
+    grades["emre"] ~= 85;
+
+    /* Printing the grades of "emre": */
+    writeln(grades["emre"]);
+}
+---
+
+$(P
+The grades can also be assigned in one go with an array literal:
+)
+
+---
+import std.stdio;
+
+void main() {
+    int[][string] grades;
+
+    grades["emre"] = [ 90, 85, 95 ];
+
+    writeln(grades["emre"]);
+}
+---
+
+)
+
+)
+
+Macros:
+        SUBTITLE=Associative Arrays Solutions
+
+        DESCRIPTION=Programming in D exercise solutions: Associative Arrays
+
+        KEYWORDS=programming in d tutorial associative arrays