From d5e0c6a96787c367a29782818b21d241280f94b2 Mon Sep 17 00:00:00 2001
From: iiitma <akinlesil@gmail.com>
Date: Fri, 25 Jun 2021 01:44:06 +0100
Subject: [PATCH] feat(index.ts): added a new function: shuffle

Shuffle takes in an array and returns a shuffled array
---
 README.md       |  5 +++++
 dist/index.d.ts |  1 +
 dist/index.js   | 34 +++++++++++++++++++++++++++++++++-
 lib/index.ts    | 38 ++++++++++++++++++++++++++++++++++++++
 test/test.js    | 27 +++++++++++++++++++++++++++
 5 files changed, 104 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 9b801df..86ba4e3 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+[![🚀 Publish](https://github.com/iiitma/js-randomize/actions/workflows/publish.yml/badge.svg?branch=main)](https://github.com/iiitma/js-randomize/actions/workflows/publish.yml)
+
 # js-randomize
 
 ## Table of Contents
@@ -62,6 +64,9 @@ var randomArray2 = random.array(array, 3);
 // randomArray2 is an array of 3 elements from array
 
 
+var shuffled = randomz.shuffle(array); 
+// shuffled is a shuffled version of array
+
 ```
 
 ### Typescript
diff --git a/dist/index.d.ts b/dist/index.d.ts
index dcbc42f..1cb273d 100644
--- a/dist/index.d.ts
+++ b/dist/index.d.ts
@@ -4,3 +4,4 @@ export declare function intArray(count?: Number, min?: Number, max?: Number): Nu
 export declare function floatArray(count?: Number, min?: Number, max?: Number, dp?: Number): Number[];
 export declare function boolean(): boolean;
 export declare function array(array: any[], count?: Number): any[];
+export declare function shuffle(array: any[]): any[];
diff --git a/dist/index.js b/dist/index.js
index ec53222..7fdabb9 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -1,6 +1,6 @@
 "use strict";
 Object.defineProperty(exports, "__esModule", { value: true });
-exports.array = exports.boolean = exports.floatArray = exports.intArray = exports.float = exports.int = void 0;
+exports.shuffle = exports.array = exports.boolean = exports.floatArray = exports.intArray = exports.float = exports.int = void 0;
 // generate integer from range
 function int(min = 0, max = 100) {
     // add runtime check for use in JavaScript
@@ -78,3 +78,35 @@ function array(array, count = 1) {
     return result;
 }
 exports.array = array;
+// generate shuffled array from array
+function shuffle(array) {
+    // add runtime check for use in JavaScript
+    if (!Array.isArray(array)) {
+        throw new Error('Invalid Inputs');
+    }
+    // get array length   
+    const length = array.length;
+    let result = [];
+    // List of value indices
+    let list = [];
+    // loop through "array length" times
+    for (let i = 0; i < length; i++) {
+        // generate random integer in range[0, array length]
+        let x = int(0, length - 1);
+        // check if value is already in list
+        while (list.includes(x)) {
+            // if already in list, generate new value
+            x = int(0, length - 1);
+        }
+        // if not, add to list
+        list.push(x);
+    }
+    // loop through "list length" times
+    for (let i = 0; i < length; i++) {
+        // ad to array value to result
+        result.push(array[list[i]]);
+    }
+    // return shuffled array
+    return result;
+}
+exports.shuffle = shuffle;
diff --git a/lib/index.ts b/lib/index.ts
index a0a3dda..3b827ca 100644
--- a/lib/index.ts
+++ b/lib/index.ts
@@ -79,3 +79,41 @@ export function array(array: any[], count: Number=1): any[] {
 }
 
 
+// generate shuffled array from array
+export function shuffle(array: any[]): any[] {
+    // add runtime check for use in JavaScript
+    if (!Array.isArray(array)) {
+        throw new Error('Invalid Inputs')
+     }
+
+    // get array length   
+    const length = array.length;
+
+    let result: any[] = [];
+
+    // List of value indices
+    let list: any[] =[];
+
+     // loop through "array length" times
+    for(let i = 0; i < length; i++){
+
+        // generate random integer in range[0, array length]
+        let x = int(0, length-1)
+
+        // check if value is already in list
+        while(list.includes(x)){
+            // if already in list, generate new value
+            x = int(0, length-1)
+        }
+        // if not, add to list
+        list.push(x)    
+    }
+
+    // loop through "list length" times
+    for(let i = 0; i < length; i++){
+        // ad to array value to result
+        result.push(array[list[i]])
+    }
+    // return shuffled array
+    return result
+}
diff --git a/test/test.js b/test/test.js
index e48a22a..1c71309 100644
--- a/test/test.js
+++ b/test/test.js
@@ -241,3 +241,30 @@ describe('Random Array - array()', function () {
     });
 });
 
+
+describe('Suffle Array - shuffle()', function () {
+    it('should return a shuffled array', function () {
+
+        // 1. ARRANGE
+        const tests = [[ 31, 71, 34, 3, 25 ], ['Married', 'Single', 'Divorced', 'Widowed'],  ['Self Employed', 'Employed', 'Unemployed', 'Retired', 'Student'], ['0809', '0805', '0803', '0806', '0807', '0802', '0808', '0709', '0705', '0703', '7806', '0707', '0702', '0708', '0909', '0905', '0903', '0906', '0907', '0902', '0908']]
+
+        // 2. ACT
+        let result = []
+        for (const test of tests) {
+         y = random.shuffle(test)
+            result.push(y)
+        }
+
+        // 3. ASSERT
+        for (const i in tests) {
+            expect(Array.isArray(result[i])).to.be.equal(true);
+            expect(result[i].length).to.be.equal(tests[i].length);  
+            let index = []
+            for(const element of result[i]){
+                index.push(tests[i].indexOf(element))
+            }
+            expect( _.range(0, 10).join(',') !== index.join(',')).to.be.equal(true);
+        }
+
+    });
+});
\ No newline at end of file