stdlib [array]: Better array joining

src/stdlib/primitive/Array/lib/collapse.es6

@@ -0,0 +1,11 @@
+export default (api) => ["collapse", api.var(new api.func(
+    [
+        ["dimensions", {
+            Type: api.string,
+            Splat: true
+        }]
+    ],
+    function(scope, input) {
+        // TODO:
+    }
+))];

src/stdlib/primitive/Array/lib/fuse.es6

@@ -0,0 +1,28 @@
+export default (api) => ["fuse", api.prop(new api.func(
+    [],
+    function(scope, input) {
+        let self = input("self").value;
+
+        let stringified = "",
+            cast, text;
+
+        for (let i = 0; i < self.length; i++) {
+            cast = (self[i] instanceof api.string) || self[i].constructor.Cast.get('String');
+
+            if (cast) {
+                if (cast === true) {
+                    text = self[i].value;
+                } else {
+                    text = cast(self[i]).value;
+                }
+                stringified += "" + text;
+            } else {
+                return `Cannot stringify \`${
+                    self[i].constructor.Name || self[i].Name
+                }\` in join`;
+            }
+        }
+
+        return api.init(api.string, stringified);
+    }
+))]

test/tests/primitives/op/array.js

@@ -0,0 +1,18 @@
+var TestCheddarFrom = require('../../globals').TestCheddarFrom;
+var chai = require('chai');
+var expect = chai.expect;
+chai.should();
+
+describe('Array', function() {
+    describe('has', function() {
+        it('should print true', TestCheddarFrom.Code(
+            'print [1] has 1',
+            'true'
+        ))
+
+        it('should print false', TestCheddarFrom.Code(
+            'print [1] has 2',
+            'false'
+        ))
+    })
+});