Introduce some functional programming techniques

src/file/footnotes/footnote/footnote-attributes.ts

@@ -1,12 +1,12 @@
 import { XmlAttributeComponent } from "file/xml-components";
 
 export interface IFootnoteAttributesProperties {
-    type?: string;
-    id: number;
+    readonly type?: string;
+    readonly id: number;
 }
 
 export class FootnoteAttributes extends XmlAttributeComponent<IFootnoteAttributesProperties> {
-    protected xmlKeys = {
+    protected readonly xmlKeys = {
         type: "w:type",
         id: "w:id",
     };

src/file/footnotes/footnote/run/reference-run.ts

@@ -3,11 +3,11 @@ import { Style } from "file/paragraph/run/style";
 import { XmlAttributeComponent, XmlComponent } from "file/xml-components";
 
 export interface IFootNoteReferenceRunAttributesProperties {
-    id: number;
+    readonly id: number;
 }
 
 export class FootNoteReferenceRunAttributes extends XmlAttributeComponent<IFootNoteReferenceRunAttributesProperties> {
-    protected xmlKeys = {
+    protected readonly xmlKeys = {
         id: "w:id",
     };
 }

src/file/footnotes/footnotes-attributes.ts

@@ -1,27 +1,27 @@
 import { XmlAttributeComponent } from "file/xml-components";
 
 export interface IFootnotesAttributesProperties {
-    wpc?: string;
-    mc?: string;
-    o?: string;
-    r?: string;
-    m?: string;
-    v?: string;
-    wp14?: string;
-    wp?: string;
-    w10?: string;
-    w?: string;
-    w14?: string;
-    w15?: string;
-    wpg?: string;
-    wpi?: string;
-    wne?: string;
-    wps?: string;
-    Ignorable?: string;
+    readonly wpc?: string;
+    readonly mc?: string;
+    readonly o?: string;
+    readonly r?: string;
+    readonly m?: string;
+    readonly v?: string;
+    readonly wp14?: string;
+    readonly wp?: string;
+    readonly w10?: string;
+    readonly w?: string;
+    readonly w14?: string;
+    readonly w15?: string;
+    readonly wpg?: string;
+    readonly wpi?: string;
+    readonly wne?: string;
+    readonly wps?: string;
+    readonly Ignorable?: string;
 }
 
 export class FootnotesAttributes extends XmlAttributeComponent<IFootnotesAttributesProperties> {
-    protected xmlKeys = {
+    protected readonly xmlKeys = {
         wpc: "xmlns:wpc",
         mc: "xmlns:mc",
         o: "xmlns:o",

src/file/footnotes/footnotes.ts

@@ -6,12 +6,13 @@ import { SeperatorRun } from "./footnote/run/seperator-run";
 import { FootnotesAttributes } from "./footnotes-attributes";
 
 export class FootNotes extends XmlComponent {
-    private counter: number;
+    // tslint:disable-next-line:readonly-keyword
+    private currentId: number;
 
     constructor() {
         super("w:footnotes");
 
-        this.counter = 1;
+        this.currentId = 1;
 
         this.root.push(
             new FootnotesAttributes({
@@ -61,10 +62,10 @@ export class FootNotes extends XmlComponent {
     }
 
     public createFootNote(paragraph: Paragraph): void {
-        const footnote = new Footnote(this.counter);
+        const footnote = new Footnote(this.currentId);
         footnote.addParagraph(paragraph);
         this.root.push(footnote);
 
-        this.counter++;
+        this.currentId++;
     }
 }