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<div class="pt-4 px-2 md:px-0 lg:px-4 pb-16 w-full overflow-hidden">
<h1>Collections</h1>
<p>
<b>GoJS</b> provides its own collection classes: <a>List</a>, <a>Set</a>, and <a>Map</a>.
You can iterate over a collection by using an <a>Iterator</a>.
</p>
<p>
These collection classes have several advantages over using JavaScript arrays as lists or objects as maps.
They raise an error when trying to get the next item of an iterator if the collection has been modified since getting the iterator.
They can be made read-only to avoid unexpected modifications.
They offer methods not found on simple arrays or objects, such as <a>Iterator.any</a>, <a>Iterator.all</a>, and <a>Iterator.each</a>.
If you are writing in TypeScript, they optionally enforce compile-time type checking of the item types.
</p>
<p>
In <b>GoJS</b> most of the properties and methods that return collections describing the structure of the diagram return an <a>Iterator</a>.
That is because the implementation of the collections are internal -- you only need to know how to iterate over the result collection.
Other methods or properties will allow you to modify the diagram.
An example is <a>Diagram.nodes</a>, which returns the current collection of <a>Node</a>s and <a>Group</a>s in the diagram as an <a>Iterator</a>.
The collection is automatically modified as the programmer adds or removes node data in the model or by direct calls to
<a>Diagram.add</a> or <a>Diagram.remove</a>.
</p>
<p>
However there are a few properties that return collections that are allowed to be modified.
Examples include collections on classes that are usually frozen after initialization:
<a>Geometry.figures</a>, <a>PathFigure.segments</a>, and <a>Brush.colorStops</a>.
Other examples include collections that are modified very infrequently, usually only upon diagram initialization:
<a>ToolManager.mouseDownTools</a> (and the other lists of tools) and <a>Diagram.nodeTemplateMap</a>
(and other template maps).
</p>
<p>
See samples that make use of collections in the <a href="../samples/index.html#collections">samples index</a>.
</p>
<h2 id="List">List</h2>
<p>
A <a>List</a> is an ordered collection of values that are indexed by integers from zero to one less than the count.
</p>
<pre class="lang-js"><code>
var l = new go.List();
l.add("A");
l.add("B");
l.add("C");
assert(l.count === 3);
assert(l.elt(0) === "A");
assert(l.has("B"));
assert(l.indexOf("B") === 1);
l.setElt(1, "z"); // replace an item
assert(l.elt(1) === "z");
l.removeAt(1); // remove an item
assert(l.count === 2);
assert(l.elt(1) === "C");
</code></pre>
<p>
In 2.0, the optional argument to the <a>List</a> constructor has been removed.
However, if you are writing in TypeScript, GoJS collections classes (<code>List</code>, <code>Map</code>, <code>Set</code>) are now generic, and will help you enforce types:
</p>
<pre class="lang-ts"><code>
// TypeScript:
var l = new go.List<string>(); // Create a list of only strings
l.add("A");
l.add(23); // throws an error during compilation or in an IDE
l.add({}); // throws an error during compilation or in an IDE
</code></pre>
<p>
To iterate over a <a>List</a>, get its <a>List.iterator</a> and call <a>Iterator.next</a>
on it to advance its position in the list. Its <a>Iterator.value</a> will be a list item;
its <a>Iterator.key</a> will be the corresponding index in the list.
</p>
<pre class="lang-js"><code>
var l = new go.List();
l.add("A");
l.add("B");
l.add("C");
var it = l.iterator;
while (it.next()) {
console.log(it.key + ": " + it.value);
}
// This outputs:
// 0: A
// 1: B
// 2: C
</code></pre>
<h2 id="Set">Set</h2>
<p>
A <a>Set</a> is an unordered collection of values that does not allow duplicate values.
This class is similar to the <code>Set</code> object that is defined in ECMAScript 2015 (ES6).
</p>
<p>
The optional argument to the <a>Set</a> constructor specifies the type of the items that may be added to the set.
</p>
<pre class="lang-js"><code>
var s = new go.Set();
s.add("A");
s.add("B");
s.add("C");
s.add("B"); // duplicate is ignored
assert(s.count === 3);
assert(s.has("B"));
s.remove("B"); // remove an item
assert(s.count === 2);
assert(!s.has("B"));
</code></pre>
<p>
As with <code>List</code> and <code>Map</code>, in 2.0 the optional argument to the <a>Set</a> constructor has been removed, but it is now a generic class in TypeScript and can enforce types:
</p>
<pre class="lang-ts"><code>
// TypeScript:
var s = new go.Set<string>(); // Create a set of only strings
s.add("A");
s.add(23); // throws an error during compilation or in an IDE
s.add({}); // throws an error during compilation or in an IDE
</code></pre>
<p>
Iterating over the items in a <a>Set</a> is just like iterating over a <a>List</a>,
except that the order of the items may vary.
</p>
<pre class="lang-js"><code>
var s = new go.Set();
s.add("A");
s.add("B");
s.add("C");
s.add("B"); // duplicate is ignored
var it = s.iterator;
while (it.next()) {
console.log(it.value);
}
// This might output, perhaps in different order:
// A
// B
// C
</code></pre>
<h2 id="Map">Map</h2>
<p>
A <a>Map</a> is an unordered collection of key-value pairs that are indexed by the keys.
This class is similar to the <code>Map</code> object that is defined in ECMAScript 2015 (ES6).
</p>
<p>
The two optional arguments to the <a>Map</a> constructor specifies the types of the keys and the types of the item values that may be added to the map.
</p>
<pre class="lang-js"><code>
var m = new go.Map();
m.add("A", 1); // associate "A" with 1
m.add("B", 2);
m.add("C", 3);
assert(s.count === 3);
assert(s.has("B"));
assert(s.get("B") === 2);
m.add("B", 222); // replace the value for "B"
assert(s.get("B") === 222);
s.remove("B"); // remove an item
assert(s.count === 2);
assert(!s.has("B"));
assert(s.get("B") === null);
</code></pre>
<p>
As with <code>List</code> and <code>Set</code>, in 2.0 the optional arguments to the <a>Map</a> constructor have been removed, but it is now a generic class in TypeScript and can enforce types:
</p>
<pre class="lang-ts"><code>
// TypeScript:
var m = new go.Map<string, number>(); // Create a map of strings to numbers
m.add("A", 1);
m.add(23, 23); // throws an error during compilation or in an IDE
m.add({}, 23); // throws an error during compilation or in an IDE
</code></pre>
<p>
Iterating over the items in a <a>Map</a> is just like iterating over a <a>List</a>,
but offering access to both the keys and the values.
As with <a>Set</a>s the order of the items may vary.
</p>
<pre class="lang-js"><code>
var m = new go.Map();
m.add("A", 1); // associate "A" with 1
m.add("B", 2);
m.add("C", 3);
m.add("B", 222); // replace the value for "B"
// Normal iteration lets you get both the key and its corresponding value:
var it = m.iterator;
while (it.next()) {
console.log(it.key + ": " + it.value);
}
// This might output, perhaps in different order:
// A: 1
// B: 222
// C: 3
// To get a collection of the keys, use Map.iteratorKeys:
var kit = m.iteratorKeys;
while (kit.next()) {
console.log(kit.value);
}
// This might output, perhaps in different order:
// A
// B
// C
// To get a collection of the values, use Map.iteratorValues:
var vit = m.iteratorValues;
while (vit.next()) {
console.log(vit.value);
}
// This might output, perhaps in different order:
// 1
// 222
// 3
</code></pre>
<p>
Typically one uses <a>Map.iteratorKeys</a> or <a>Map.iteratorValues</a>
when needing to pass a collection on to other methods that take an <a>Iterator</a>.
</p>
<h2 id="MoreIterationExamples">More Iteration Examples</h2>
<p>
It is commonplace to iterate over the selected <a>Part</a>s of a <a>Diagram</a>:
<pre class="lang-js"><code>
for (var it = diagram.selection.iterator; it.next(); ) {
var part = it.value; // part is now a Node or a Group or a Link or maybe a simple Part
if (part instanceof go.Node) { . . . }
else if (part instanceof go.Link) { . . . }
}
</code></pre>
Alternatively:
<pre class="lang-js"><code>
diagram.selection.each(function(part) {
// part is now a Node or a Group or a Link or maybe a simple Part
if (part instanceof go.Node) { . . . }
else if (part instanceof go.Link) { . . . }
});
</code></pre>
</p>
<p>
Sometimes one needs to iterate over the <a>Node</a>s in a <a>Diagram</a>:
<pre class="lang-js"><code>
for (var it = diagram.nodes; it.next(); ) {
var n = it.value; // n is now a Node or a Group
if (n.category === "Special") { . . . }
}
</code></pre>
</p>
<p>
You can also iterate over the port elements in a <a>Node</a>, or the <a>Link</a>s connected to a port element:
<pre class="lang-js"><code>
for (var pit = node.ports; pit.next(); ) {
var port = pit.value; // port is now a GraphObject within the node
for (var lit = node.findLinksConnected(port.portId); lit.next(); ) {
var link = lit.value; // link is now a Link connected with the port
if (link.data.xyz === 17) { . . . }
}
}
</code></pre>
</p>
<p>
Or perhaps you need to iterate over the elements of a <a>Panel</a>:
<pre class="lang-js"><code>
for (var it = panel.elements; it.next(); ) {
var elt = it.value; // elt is now a GraphObject that is an immediate child of the Panel
if (elt instanceof go.TextBlock) { . . . }
else if (elt instanceof go.Panel) { . . . recurse . . . }
}
</code></pre>
</p>
<p>
If you want to find <a>Node</a>s that are immediate members of a <a>Group</a>:
<pre class="lang-js"><code>
for (var mit = group.memberParts; mit.next(); ) {
var part = mit.value; // part is now a Part within the Group
if (part instanceof go.Node) { . . . maybe work with part.data . . . }
}
</code></pre>
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