added option for custom prng to random

dist/@types/chrisweb-utilities/utilities/random.d.ts

@@ -3,6 +3,6 @@
  * @param min
  * @param max
  */
-declare const randomInteger: (min?: number, max?: number) => number;
-declare const choice: (sequence?: unknown[]) => unknown;
+declare const randomInteger: (min?: number, max?: number, prng?: typeof Math) => number;
+declare const choice: (sequence?: unknown[], prng?: typeof Math) => unknown;
 export { randomInteger, choice };

package.json

@@ -1,6 +1,6 @@
 {
   "name": "chrisweb-utilities",
-  "version": "1.3.0",
+  "version": "1.3.1",
   "description": "chrisweb utilities",
   "types": "dist/@types/chrisweb-utilities/index.d.ts",
   "scripts": {
@@ -35,7 +35,7 @@
   "devDependencies": {
     "@types/jest": "26.0.10",
     "jest": "26.4.2",
-    "rollup": "2.26.6",
+    "rollup": "2.26.8",
     "rollup-plugin-typescript2": "0.27.2",
     "ts-jest": "26.3.0",
     "eslint": "7.7.0",

src/utilities/random.ts

@@ -3,12 +3,22 @@
  * @param min 
  * @param max 
  */
-const randomInteger = (min = 0, max = Infinity): number => {
-    return Math.floor(Math.random() * (max - min + 1) + min);
+const randomInteger = (min = 0, max = Infinity, prng?: typeof Math): number => {
+    // support for custom PRNGs, like https://www.npmjs.com/package/seedrandom
+    if (prng) {
+        prng.floor(prng.random() * (max - min + 1) + min);
+    } else {
+        return Math.floor(Math.random() * (max - min + 1) + min);
+    }
 }
 
-const choice = (sequence: unknown[] = []): unknown => {
-    return sequence[Math.floor(Math.random() * sequence.length)];
+const choice = (sequence: unknown[] = [], prng?: typeof Math): unknown => {
+    // support for custom PRNGs, like https://www.npmjs.com/package/seedrandom
+    if (prng) {
+        return sequence[prng.floor(prng.random() * sequence.length)];
+    } else {
+        return sequence[Math.floor(Math.random() * sequence.length)];
+    }
 }
 
 export { randomInteger, choice }