initial

src/helpers/common.ts

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+import { Logger, ILogObj } from 'tslog';
+
+const log: Logger<ILogObj> = new Logger({ name: '[CommonHelper]', type: 'pretty' });
+
+export default class CommonHelper {
+    static randomInteger(min: number, max: number): number | null {
+        if (min > 0 && max > 0) {
+            return Math.floor(Math.random() * (max - min + 1)) + min;
+        } else {
+            log.error(new Error('Min & Max must be > 0'));
+            return null
+        }
+    }
+
+    static inArray(array: string[], keyword: string): boolean {
+        for (let val of array) {
+            if (val === keyword) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    static async sleep(seconds: number): Promise<void> {
+        if (seconds > 0) {
+            return new Promise((resolve) => setTimeout(resolve, seconds * 1000));
+        } else {
+            log.error(new Error('Second must be > 0'));
+        }
+    }
+
+    static convertArrayToObject(object: any, key: string, val = ''): any {
+        const ret: any = {};
+
+        for (let i in object) {
+            const d = object[i];
+
+            if (val) {
+                ret[d[key]] = d[val];
+            } else {
+                ret[d[key]] = d;
+            }
+        }
+
+        return ret;
+    }
+
+    static countObject(obj: any): number {
+        let c = 0;
+
+        for (let s in obj) {
+            c++;
+        }
+
+        return c;
+    }
+
+    static capitalizeFirstLetter(str: string): string {
+        if (str) {
+            return str.charAt(0).toUpperCase() + str.slice(1);
+        }
+
+        return '';
+    }
+}