Assignment 7

Assigment-7/JS_Fundamentals.js

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+//Write a function mapBy to convert an array of objects into an object mapped by the specified key:
+
+let users = [{
+    "id": 1,
+    "first_name": "Nicki",
+    "email": "ncrozier0@squarespace.com",
+    "date_of_birth": "2009/05/09"
+    }, {
+    "id": 2,
+    "first_name": "Raychel",
+    "email": "rmcgrady1@cpanel.net",
+    "date_of_birth": "1996/11/05"
+    }];
+    //mapBy(users, "first_name") 
+
+    //This should return
+    //{
+    // “Nicki”:{id:1, first_name:”Nicki”, ...},
+    // “Raychel”:{id:2, first_name:”Raychell”, ...},
+    //}
+
+     function mapBy(users,first_name){
+
+        return users.reduce((result,item)=>{
+        //Putting new entry
+            result[item[first_name]]=item
+            return result
+        },{})
+    }
+
+    console.log(mapBy(users,'first_name'))
+
+
+
+
+
+
+
+
+

Assigment-7/JS_Fundamentals2.js

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+//Write a functiongroupBy to convert an array of objects into groups based on the specified key:
+ let users = [{
+"id": 1,
+"first_name": "Nicki",
+"email": "ncrozier0@squarespace.com",
+"date_of_birth": "2009/05/09",
+"gender":"Male",
+}, {
+"id": 2,
+"first_name": "Raychel",
+"email": "rmcgrady1@cpanel.net",
+"date_of_birth": "1996/11/05",
+  "gender":"Female"
+}, {
+"id": 3,
+"first_name": "Demetris",
+"email": "dkilshall2@elpais.com",
+"date_of_birth": "2018/12/31",
+  "gender":"Male"
+}, {
+"id": 4,
+"first_name": "Amata",
+"email": "abraiden3@canalblog.com",
+"date_of_birth": "2012/05/23",
+  "gender":"Female"
+}];
+//groupBy(users, "gender")
+//This should return 
+//{
+//“Male”:[
+// {id:1, first_name:”Nicki”, ...}, 
+// {id:3, first_name:”Demetris”, ...}
+//]
+//“Female”:[
+// {id: 2, first_name:”Raychel”, ...},
+// {id: 4, first_name:”Amata”, ...}
+//]
+//}
+
+function groupBy(users,gender){
+
+    return users.reduce((result,item)=>{
+        debugger
+        //Putting new entry
+        if(!result[gender]) {
+            result[gender] = [];
+        }
+        if(item.gender === gender) {
+            result[gender].push(item);
+        }
+        return result
+        },{})
+
+}
+console.log(groupBy(users,"Male"))

Assigment-7/JS_Fundamentals3.js

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+//Sorting an Array of Object
+//Write a function that sorts an array of objects by the key that is passed in the second argument, and in the order passed as the 3rd argiment. 
+
+
+let users = [{
+"id": 1,
+"first_name": "Nicki",
+"email": "ncrozier0@squarespace.com",
+"date_of_birth": "2009/05/09",
+"gender":"Male",
+}, {
+"id": 2,
+"first_name": "Raychel",
+"email": "rmcgrady1@cpanel.net",
+"date_of_birth": "1996/11/05",
+  "gender":"Female"
+}, {
+"id": 3,
+"first_name": "Demetris",
+"email": "dkilshall2@elpais.com",
+"date_of_birth": "2018/12/31",
+  "gender":"Male"
+}, {
+"id": 4,
+"first_name": "Amata",
+"email": "abraiden3@canalblog.com",
+"date_of_birth": "2012/05/23",
+  "gender":"Female"
+}]
+
+
+//sort(users, “id”, “desc”) //Should return users sorted by id in descending order
+//sort(users, “first_name “desc”) //Should return users sorted by first_name in ascending order
+
+
+function sortBy(users,key,order){
+    let sortedUser=users.sort((a1,b1)=>{
+          const aValue=a1[key]
+          const bValue=b1[key]
+          if(order==="asc"){
+            return (aValue<bValue)?-1:(aValue>bValue)?1:0
+          }
+          else if(order==="desc"){
+            return (aValue<bValue)? 1:(aValue>bValue)? -1:0
+          }
+          else{
+            return "order is invalid"
+          }
+    })
+
+return sortedUser
+}
+console.log(sortBy(users,"email","desc"))

Assigment-7/JS_Fundamentals4.js

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+//Given 2 arrays with related objects, return a new array where objects having the same id from each of the arrays are merged. Try to achieve it with a complexity - O(n).
+
+
+let userNames = [{
+    "id": 1,
+    "first_name": "Nicki",
+    }, {
+    "id": 2,
+    "first_name": "Raychel",
+    }, {
+    "id": 3,
+    "first_name": "Demetris",
+    }, {
+    "id": 4,
+    "first_name": "Amata",
+    }]
+
+
+let userEmails = [{
+    "id": 2,
+    "email": "rmcgrady1@cpanel.net",
+    }, {
+    "id": 1,
+    "email": "ncrozier0@squarespace.com",
+    }, {
+    "id": 4,
+    "email": "abraiden3@canalblog.com",
+    }, {
+    "id": 3,
+    "email": "dkilshall2@elpais.com",
+    }]
+
+//mergeById(userNames, userEmails) 
+    //This should return an array of users in the format: 
+
+
+// Solution : 
+
+// merge botht the array of the object 
+function mergeById(arr1, arr2) {
+    const idMap = {};
+
+    // Merge objects from the first array into the map
+    for (const obj of arr1) {
+      idMap[obj.id] = { ...idMap[obj.id], ...obj };
+    }
+
+    // Merge objects from the second array into the map
+    for (const obj of arr2) {
+      idMap[obj.id] = { ...idMap[obj.id], ...obj };
+    }
+
+    // Convert the map values into an array
+    const result = Object.values(idMap);
+
+    return result;
+  }
+
+console.log(mergeById( userNames,userEmails))
+

Assigment-7/JS_Fundamentals5.js

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+//Write a function to filter an array of strings to hold only unique values
+let array=["naaz","neha","priya","naaz","sili","hachiko"]
+
+
+// Without using Set
+
+function uniqueElements(array){
+let uniqueArray=[]
+for(let i=0;i<array.length;i++){
+    if(!uniqueArray.includes(array[i])){
+        uniqueArray.push(array[i])
+
+    }
+}
+    return uniqueArray
+}
+console.log(uniqueElements(array))
+
+// With using set
+
+function unique(array){
+    let uniqueArr= new Set(array)
+    return uniqueArr
+}
+console.log(unique(array))

Assigment-7/Question_1.js

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+//  How will you create a new copy of the object below while updating the value of address.details[0] to “5“?
+
+let obj={
+    name:"Harry Potter",
+    age:12 ,
+    address:{
+    details:["4","Privet Drive"],
+    area:"Little Whinging",
+    city:"Survey",
+    state:"England"
+    }
+}
+// by using in built methods---Structured Clone 
+let newObj2= structuredClone(obj)
+newObj2.address.details[0]='5'
+console.log(obj)
+console.log(newObj2)
+
+/// by using spread operator 
+
+let newObj={...obj, address:{...obj.address,details:[...obj.address.details]}}
+newObj.address.details[0]='6'
+console.log(newObj)
+console.log(obj)
+
+
+//Write a function filterObj that will filter out all the keys of a flat object that have objects or arrays using Object.keys and Object.entries.
+
+let obj1 = {
+    a:"Apple",
+    b:["Basketball","Baseball"],
+    c: {
+     call: "cellphone"
+    },
+    d: "Dog"
+   }
+
+//filterObject(obj) //This should return {a:”Apple”, d:”Dog”}
+
+function filterObject(obj1){
+ return Object.fromEntries(Object.entries(obj1)
+ .filter(([key,value])=>{
+
+    return  typeof(value)!='object'
+})
+)
+}
+
+console.log(filterObject(obj1))

Assigment-7/index.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Document</title>
+</head>
+<body>
+    <script src="JS_Fundamentals2.js"></script>
+</body>
+</html>