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Chapter 15/End of Chapter/part2app/src/server/template_helpers.ts

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+export const style = (stylesheet: any) => {
+    return `<link href="/css/${stylesheet}" rel="stylesheet" />`;
+}
+
+export const valueOrZero = (value: any) => {
+    return value !== undefined ? value : 0;
+}
+
+export const increment = (value: any) =>  {
+    return Number(valueOrZero(value)) + 1;
+}
+
+export const isOdd = (value: any) => {
+    return Number(valueOrZero(value)) % 2;
+}