From 8225e82287c52bc1b0d01ea994db5337884ca6db Mon Sep 17 00:00:00 2001
From: Olesia Serban <olesiaserban@gmail.com>
Date: Thu, 8 Jul 2021 16:44:50 +0300
Subject: [PATCH 1/4] changeCase, filterNonUnique, alphabetSort,
 getSecondMinimum, doubleEveryEven, getArrayElementsPairs

---
 modules/1_basics/index.js | 72 +++++++++++++++++++++++++++++++++++----
 1 file changed, 66 insertions(+), 6 deletions(-)

diff --git a/modules/1_basics/index.js b/modules/1_basics/index.js
index cb5ff10..755585a 100644
--- a/modules/1_basics/index.js
+++ b/modules/1_basics/index.js
@@ -1,32 +1,92 @@
 /**
  * Change the capitalization of all letters in a string
  */
-export const changeCase = () => {};
+export const changeCase = (str) => {
+    let result = '';
+    for(let i = 0; i < str.length; i++) {
+        let char = str.charAt(i);
+        if(char === char.toUpperCase()){
+            char = char.toLowerCase();
+        }else if(char === char.toLowerCase()){
+            char = char.toUpperCase();
+        }
+        result = result + char;
+    }
+    return result;
+};
 
 /**
  * Filter out the non-unique values in an array
  */
-export const filterNonUnique = () => {};
+export const filterNonUnique = (arr) => {
+    let result = [];
+    for (const element of arr) {
+        let elmentCounter = 0;
+        for(const el2 of arr) {
+            if (element === el2){
+                elmentCounter++;
+            }
+        }
+        if(elmentCounter === 1) {
+        result.push(element);
+        }
+    }
+    return result;
+};
 
 /**
  * Sort string in alphabetical order
  */
-export const alphabetSort = () => {};
+export const alphabetSort = (str) => {
+    let chars = str.split('');
+    let sortedChars = chars.sort();
+    return sortedChars.join('');
+};
 
 /**
  * Get min integer
  */
-export const getSecondMinimum = () => {};
+export const getSecondMinimum = (arr) => {
+    let min = null;
+    let secMin = null;
+    arr = arr.sort();
+    for (const el of arr){
+        if (min === null || el <= min){
+            min = el;
+        } else if (secMin === null || el <= secMin) {
+            secMin = el;
+        }
+    }
+    return secMin != null ? secMin : min;
+};
 
 /**
  * Double every even integer
  */
-export const doubleEveryEven = () => {};
+export const doubleEveryEven = (arr) => {
+    let result = [];
+    for(const element of arr) {
+        if(element % 2 === 0){
+            result.push(element * 2);
+        }else{
+            result.push(element);
+        }
+    }
+    return result;
+};
 
 /**
  * Create array with all possible pairs of two arrays
  */
-export const getArrayElementsPairs = () => {};
+export const getArrayElementsPairs = (arr1, arr2) => {
+    let result = [];
+    for(const el1 of arr1){
+        for (const el2 of arr2){
+            result.push([el1, el2]);
+        }
+    }
+    return result;
+};
 
 /**
  * Deep equal

From 9691d05d848b2bf291c19abf8f499e4e6ba5798e Mon Sep 17 00:00:00 2001
From: Olesia Serban <olesiaserban@gmail.com>
Date: Thu, 8 Jul 2021 20:51:32 +0300
Subject: [PATCH 2/4] formatDate

---
 modules/1_basics/index.js | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/modules/1_basics/index.js b/modules/1_basics/index.js
index 755585a..9211481 100644
--- a/modules/1_basics/index.js
+++ b/modules/1_basics/index.js
@@ -96,4 +96,19 @@ export const deepEqual = () => {};
 /**
  * Format date
  */
-export const formatDate = () => {};
+export const formatDate = (date) => {
+    if (Array.isArray(date)){
+        date = new Date(date[0], date[1], date[2]);
+    } else {
+        date = new Date(date);
+    }
+      
+    let day = date.getDate() + '';
+    day = day.padStart(2, '0');
+    let month = date.getMonth() + 1 + '';
+    month = month.padStart(2,'0');
+    let year = date.getFullYear() + '';
+    year = year.slice(-2);
+    let result = day + "." + month + "." + year;
+    return result;
+};

From 94be2aaffb676eb9b0d531e9e28cf1fb0d41e6cc Mon Sep 17 00:00:00 2001
From: Olesia Serban <olesiaserban@gmail.com>
Date: Thu, 8 Jul 2021 21:34:40 +0300
Subject: [PATCH 3/4] deepEqual

---
 modules/1_basics/index.js | 26 +++++++++++++++++++++++++-
 1 file changed, 25 insertions(+), 1 deletion(-)

diff --git a/modules/1_basics/index.js b/modules/1_basics/index.js
index 9211481..968d977 100644
--- a/modules/1_basics/index.js
+++ b/modules/1_basics/index.js
@@ -91,7 +91,31 @@ export const getArrayElementsPairs = (arr1, arr2) => {
 /**
  * Deep equal
  */
-export const deepEqual = () => {};
+export const deepEqual = (o1, o2) => {
+    function isObject(obj) {
+        return obj === Object(obj);
+    }
+    
+    if (o1 === o2) {
+        return true;
+    }
+    
+    for(var p in o1){
+        if(!o2.hasOwnProperty(p)) { // o2 does not have such property
+            return false;
+        }
+        if(!isObject(o1[p]) && o1[p]!== o2[p]) { // is simple type and not equal to o2
+            return false;
+        } else if (isObject(o1[p]) && !isObject(o2[p])) { // o2 property is not complex type
+            return false;
+        } else if (isObject(o1[p]) && isObject(o2[p])){ // both are complex types
+            if(!deepEqual(o1[p], o2[p])) { // recursion check nested property
+                return false;
+            }
+        }
+    }
+    return true; // has not failed the previous steps
+};
 
 /**
  * Format date

From db4e05574791d88f4d69096ffb6711fc47a9890c Mon Sep 17 00:00:00 2001
From: Olesia Serban <olesiaserban@gmail.com>
Date: Thu, 8 Jul 2021 22:29:00 +0300
Subject: [PATCH 4/4] changing to str interpolation

---
 modules/1_basics/index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/modules/1_basics/index.js b/modules/1_basics/index.js
index 968d977..2bcd350 100644
--- a/modules/1_basics/index.js
+++ b/modules/1_basics/index.js
@@ -133,6 +133,6 @@ export const formatDate = (date) => {
     month = month.padStart(2,'0');
     let year = date.getFullYear() + '';
     year = year.slice(-2);
-    let result = day + "." + month + "." + year;
+    let result = `${day}.${month}.${year}`;
     return result;
 };