Assignment1: Javascript assignment 1

assignment1/Type_conversions/q1.js

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+let age=25;
+if((typeof age)==number &&  age>0){
+    if (age<=12){
+        console.log("child")
+    }
+    else if(age>=13 && age<=18){
+        console.log("teen")
+    }
+    else{
+        console.log("adult")
+    }
+}
+else{
+    console.log("invalid age")
+}

assignment1/Type_conversions/q2.js

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+let age=25
+
+switch(age){
+    case (age<=12):{
+        console.log("child")
+        break;
+    }
+    case (age>=13 && age<=18):{
+        console.log("teen")
+        break;
+    }
+    case (age>18):{
+        console.log("adult")
+        break;
+    }
+    default :{
+        console.log("invalid age!")
+        break;
+    }
+
+}

assignment1/Type_conversions/q3.js

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+let arraySize=25;
+
+let arr=[]
+
+for(let i=0; i<arraySize; i++){
+    arr[i]=i+1;
+}
+console.log(arr)
+

assignment1/Type_conversions/q4.js

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+let arraySize=25;
+let i=0;
+let arr=[]
+while(i<arraySize){
+    arr[i]=i+1;
+    i++
+}
+console.log(arr)

assignment1/Type_conversions/q5.js

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+//Can you use return instead of break in loops?
+
+// yes we can use return instead of break in some cases when we want to exit from the function completely,
+// in case of break we exit from the loop not from the function.
+
+function main(){
+    for(let i=0; i<5; i++){
+        if(i==3){
+            break;
+        }
+    }
+    console.log("after break statement function continues")
+}
+
+function main1(){
+    for(let i=0; i<5; i++){
+        if(i==3){
+            return
+        }
+    }
+    console.log("this will never printed after return statement executed.")
+}
+
+main();
+main1();

assignment1/Type_conversions/questions.txt

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+1. Declare a variable let age = 25;. Write a series of if else statements that will:
+○ Print child to the console if age is less than equal to 12.
+○ Print teen to the console if age is between 13 and 18 (inclusive).
+○ Print adult to the console if age is above 18
+
+
+2. Do the same using switch case.
+
+
+3. Declare a variable let arraySize = 25;. Using a for loop, add numbers from one
+onwards into an array till the arraySize is reached.
+
+
+4. Accomplish the same using a while loop.
+
+
+5. Can you use return instead of break in loops?

assignment1/arrays/mutatingVSnonmutating.txt

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+question:-What makes a method mutating or non mutating in Javascript? Find out whether each of
+          the following methods are mutating or non-mutating. How can you verify this?:
+          ○ push
+          ○ pop
+          ○ filter
+          ○ find
+          ○ sort
+          ○ map
+
+answer :- A mutating method modifies the original array, whereas a non-mutating method creates 
+          and returns a new array without changing the original one.
+
+            mutating methods are : push, pop, sort because these methods modifies the original 
+            array.
+
+            non-mutating methods are : filter, find, map these are non-mutating methods because these 
+            methods returns new array.

assignment1/arrays/q1.js

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+// Write a function filterByName that accepts a string as a parameter and returns an
+// array with only those objects where the first_name field includes that string.
+let arr=[{
+    "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"
+    }, {
+    "id": 3,
+    "first_name": "Demetris",
+    "email": "dkilshall2@elpais.com",
+    "date_of_birth": "2018/12/31"
+    }, {
+    "id": 4,
+    "first_name": "Amata",
+    "email": "abraiden3@canalblog.com",
+    "date_of_birth": "2012/05/23"
+    }, {
+    "id": 5,
+    "first_name": "Venita",
+    "email": "vheap4@clickbank.net",
+    "date_of_birth": "2020/10/04"
+    }, {
+    "id": 6,
+    "first_name": "Fairfax",
+    "email": "fcrichton5@merriam-webster.com",
+    "date_of_birth": "2009/12/23"
+    }, {
+    "id": 7,
+    "first_name": "Kathleen",
+    "email": "kvasyukhnov6@devhub.com",
+    "date_of_birth": "2010/12/20"
+    }, {
+    "id": 8,
+    "first_name": "Sam",
+    "email": "scorck7@sitemeter.com",
+    "date_of_birth": "2020/08/30"
+    }, {
+    "id": 9,
+    "first_name": "Virgilio",
+    "email": "vferandez8@e-recht24.de",
+    "date_of_birth": "2000/09/07"
+    }, {
+    "id": 10,
+    "first_name": "Townie",
+    "email": "tpetyt9@upenn.edu",
+    "date_of_birth": "2018/09/01"
+    }];
+
+function filterByName(string){
+    const result=[]
+    for(const element of arr){
+        if(element.first_name.includes(string)){
+            result.push(element)
+        }
+    }    
+
+    return result
+}
+
+let arr1=[]
+arr1=filterByName("Town")
+console.log("implemented function filterByName")
+console.log(arr1)
+
+
+
+

assignment1/arrays/q2.js

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+// Use Array.map to return an array of all the email fields.
+let arr=[{
+    "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"
+    }, {
+    "id": 3,
+    "first_name": "Demetris",
+    "email": "dkilshall2@elpais.com",
+    "date_of_birth": "2018/12/31"
+    }, {
+    "id": 4,
+    "first_name": "Amata",
+    "email": "abraiden3@canalblog.com",
+    "date_of_birth": "2012/05/23"
+    }, {
+    "id": 5,
+    "first_name": "Venita",
+    "email": "vheap4@clickbank.net",
+    "date_of_birth": "2020/10/04"
+    }, {
+    "id": 6,
+    "first_name": "Fairfax",
+    "email": "fcrichton5@merriam-webster.com",
+    "date_of_birth": "2009/12/23"
+    }, {
+    "id": 7,
+    "first_name": "Kathleen",
+    "email": "kvasyukhnov6@devhub.com",
+    "date_of_birth": "2010/12/20"
+    }, {
+    "id": 8,
+    "first_name": "Sam",
+    "email": "scorck7@sitemeter.com",
+    "date_of_birth": "2020/08/30"
+    }, {
+    "id": 9,
+    "first_name": "Virgilio",
+    "email": "vferandez8@e-recht24.de",
+    "date_of_birth": "2000/09/07"
+    }, {
+    "id": 10,
+    "first_name": "Townie",
+    "email": "tpetyt9@upenn.edu",
+    "date_of_birth": "2018/09/01"
+    }];
+
+console.log("Array.map to return an array of all the email fields")
+const emailArr=arr.map(element=>element.email);
+console.log(emailArr)
+

assignment1/arrays/q3.js

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+// Use Array.sort to return the array sorted in descending order by date_of_birth.
+let arr=[{
+    "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"
+    }, {
+    "id": 3,
+    "first_name": "Demetris",
+    "email": "dkilshall2@elpais.com",
+    "date_of_birth": "2018/12/31"
+    }, {
+    "id": 4,
+    "first_name": "Amata",
+    "email": "abraiden3@canalblog.com",
+    "date_of_birth": "2012/05/23"
+    }, {
+    "id": 5,
+    "first_name": "Venita",
+    "email": "vheap4@clickbank.net",
+    "date_of_birth": "2020/10/04"
+    }, {
+    "id": 6,
+    "first_name": "Fairfax",
+    "email": "fcrichton5@merriam-webster.com",
+    "date_of_birth": "2009/12/23"
+    }, {
+    "id": 7,
+    "first_name": "Kathleen",
+    "email": "kvasyukhnov6@devhub.com",
+    "date_of_birth": "2010/12/20"
+    }, {
+    "id": 8,
+    "first_name": "Sam",
+    "email": "scorck7@sitemeter.com",
+    "date_of_birth": "2020/08/30"
+    }, {
+    "id": 9,
+    "first_name": "Virgilio",
+    "email": "vferandez8@e-recht24.de",
+    "date_of_birth": "2000/09/07"
+    }, {
+    "id": 10,
+    "first_name": "Townie",
+    "email": "tpetyt9@upenn.edu",
+    "date_of_birth": "2018/09/01"
+    }];
+
+
+console.log("before sorting in descending order on the basis of date of birth")
+console.log(arr)
+arr.sort((a, b) => new Date(b.date_of_birth) - new Date(a.date_of_birth));    
+console.log("after sorting")
+console.log(arr)
+

assignment1/arrays/q4.js

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+// Write a function getById that accepts a number as a parameter and returns the
+// object where the id is equal to that number.
+
+let arr=[{
+    "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"
+    }, {
+    "id": 3,
+    "first_name": "Demetris",
+    "email": "dkilshall2@elpais.com",
+    "date_of_birth": "2018/12/31"
+    }, {
+    "id": 4,
+    "first_name": "Amata",
+    "email": "abraiden3@canalblog.com",
+    "date_of_birth": "2012/05/23"
+    }, {
+    "id": 5,
+    "first_name": "Venita",
+    "email": "vheap4@clickbank.net",
+    "date_of_birth": "2020/10/04"
+    }, {
+    "id": 6,
+    "first_name": "Fairfax",
+    "email": "fcrichton5@merriam-webster.com",
+    "date_of_birth": "2009/12/23"
+    }, {
+    "id": 7,
+    "first_name": "Kathleen",
+    "email": "kvasyukhnov6@devhub.com",
+    "date_of_birth": "2010/12/20"
+    }, {
+    "id": 8,
+    "first_name": "Sam",
+    "email": "scorck7@sitemeter.com",
+    "date_of_birth": "2020/08/30"
+    }, {
+    "id": 9,
+    "first_name": "Virgilio",
+    "email": "vferandez8@e-recht24.de",
+    "date_of_birth": "2000/09/07"
+    }, {
+    "id": 10,
+    "first_name": "Townie",
+    "email": "tpetyt9@upenn.edu",
+    "date_of_birth": "2018/09/01"
+    }];
+
+let arr5=[]
+function getById(id){
+    for(const element of arr){
+        if(element.id==id){
+            arr5.push(element)
+        }
+    }
+}
+console.log("elements by id")
+getById(5)
+console.log(arr5)