4 files changed, 71 insertions, 0 deletions
diff --git a/src/extensions/ArrayExtensions.ts b/src/extensions/ArrayExtensions.ts
new file mode 100644
index 000000000..8e125766d
--- /dev/null
+++ b/src/extensions/ArrayExtensions.ts
@@ -0,0 +1,37 @@
+export default class ArrayExtension {
+    private readonly property: string;
+    private readonly body: <T>(this: Array<T>) => any;
+
+    constructor(property: string, body: <T>(this: Array<T>) => any) {
+        this.property = property;
+        this.body = body;
+    }
+
+    assign() {
+        Object.defineProperty(Array.prototype, this.property, {
+            value: this.body,
+            enumerable: false
+        });
+    }
+
+}
+
+/**
+ * IMPORTANT: Any extension you add here *must* have a corresponding type definition
+ * in the Array<T> interface in ./General/ExtensionsTypings.ts. Otherwise,
+ * Typescript will not recognize your new function.
+ */
+const extensions = [
+    new ArrayExtension("lastElement", function () {
+        if (!this.length) {
+            return undefined;
+        }
+        return this[this.length - 1];
+    })
+];
+
+function Assign() {
+    extensions.forEach(extension => extension.assign());
+}
+
+export { Assign };
+\ No newline at end of file
diff --git a/src/extensions/General/Extensions.ts b/src/extensions/General/Extensions.ts
new file mode 100644
index 000000000..4b6d05d5f
--- /dev/null
+++ b/src/extensions/General/Extensions.ts
@@ -0,0 +1,9 @@
+import { Assign as ArrayAssign } from "../ArrayExtensions";
+import { Assign as StringAssign } from "../StringExtensions";
+
+function AssignAllExtensions() {
+    ArrayAssign();
+    StringAssign();
+}
+
+export { AssignAllExtensions };
+\ No newline at end of file
diff --git a/src/extensions/General/ExtensionsTypings.ts b/src/extensions/General/ExtensionsTypings.ts
new file mode 100644
index 000000000..370157ed0
--- /dev/null
+++ b/src/extensions/General/ExtensionsTypings.ts
@@ -0,0 +1,8 @@
+interface Array<T> {
+    lastElement(): T;
+}
+
+interface String {
+    removeTrailingNewlines(): string;
+    hasNewline(): boolean;
+}
+\ No newline at end of file
diff --git a/src/extensions/StringExtensions.ts b/src/extensions/StringExtensions.ts
new file mode 100644
index 000000000..2c76e56c8
--- /dev/null
+++ b/src/extensions/StringExtensions.ts
@@ -0,0 +1,17 @@
+function Assign() {
+
+    String.prototype.removeTrailingNewlines = function () {
+        let sliced = this;
+        while (sliced.endsWith("\n")) {
+            sliced = sliced.substring(0, this.length - 1);
+        }
+        return sliced as string;
+    };
+
+    String.prototype.hasNewline = function () {
+        return this.endsWith("\n");
+    };
+
+}
+
+export { Assign };
+\ No newline at end of file