task related spred rest destructuring

Author: nilajcoder

Programs/task1.js

@@ -0,0 +1,110 @@
+
+
+
+
+/*
+1. Remove the Middle Elements
+Given: const arr = [10, 20, 30, 40, 50, 60];
+*/
+const arr = [10, 20, 30, 40, 50, 60];
+arr.splice(2, 1); // remove 2 elements starting from index 2
+console.log(arr); // [10, 20, 50, 60]
+
+
+
+/*
+2. Split Array into Two Halves
+*/
+
+const arr1 = [10, 20, 30, 40, 50, 60];
+const mid = (arr1.length / 2);
+
+const firstHalf = arr1.slice(0, mid);
+const secondHalf = arr1.slice(mid);
+
+console.log(firstHalf);  // [10, 20, 30]
+console.log(secondHalf); // [40, 50, 60]
+
+/*
+3. Find the First Duplicate
+Given: const nums = [1, 3, 4, 2, 3, 5, 6];
+*/
+
+
+
+const nums = [1, 3, 4, 2, 3, 5, 6];
+
+const dup=nums.find((num,index)=>nums.indexOf(num)!==index);
+console.log(dup)
+
+
+
+
+/*
+
+4. const scores = [
+  { name: "A", marks: 90 },
+  { name: "B", marks: 60 },
+  { name: "C", marks: 75 },
+  { name: "D", marks: 95 }
+];
+Task:
+Use filter() to get students with marks ≥ 80.
+Use map() to return a string like: "A (90 marks)", "D (95 marks)
+*/
+const scores = [
+{ name: "A", marks: 90 }, 
+    { name: "B", marks: 60 },
+    { name: "C", marks: 75 },
+        { name: "D", marks: 95 }
+];
+const filtered = scores.filter(scores => scores.marks >= 80);
+const mapped = filtered.map(scores=> `${scores.name} (${scores.marks} marks)`);
+console.log(filtered);
+console.log(mapped);
+
+
+
+/*
+
+5. Find Student Who Failed
+ 
+Given:
+const results = [
+  { name: "Tom", marks: 85 },
+  { name: "Jerry", marks: 33 },
+  { name: "Spike", marks: 55 }
+];
+*/
+
+const results = [
+ { name: "Tom", marks: 85 },
+ { name: "Jerry", marks: 33 },
+ { name: "Spike", marks: 55 }
+];
+const findFailedStudents = results.filter(results=>results.marks<40)
+console.log(findFailedStudents)
+
+
+/*
+
+6. Array Of Object Name Age
+>=18 adult 
+*/
+
+
+const names=[
+
+    {name: "Puja",age:10},
+    {name :"Shalini",age:20},
+    {name :"Swagata",age:25}
+];
+
+const adult = names.filter(p=>p.age>=18).map(p=>p.name)
+console.log(adult);
+
+
+/*
+Diff between Find Filter Map
+
+*/

Programs/task2.js

@@ -0,0 +1,148 @@
+
+
+
+
+
+/**
+ * const obj1 = {
+  user: { name: 'Alice', age: 25 },
+  isAdmin: false
+};
+ 
+const obj2 = {
+  user: { age: 30 },
+  isAdmin: true
+};
+ 
+// Expected output:
+{
+  user: { name: 'Alice', age: 30 },
+  isAdmin: true
+}
+ */
+/* 
+Spread operator
+*/
+
+const obj1 = {
+ user: { name: 'Alice', age: 25 },
+ isAdmin: false
+};
+
+const obj2 = {
+     user: { age: 30 },
+   isAdmin: true
+};
+
+// Merging obj1 and obj2
+const merged = {   
+
+    ...obj1,...obj2,
+    user:{
+        ...obj1.user,
+        ...obj2.user
+    }
+};
+
+console.log(merged)
+
+/*
+
+Destrcturing
+
+
+//Array destructuring
+let arr = [1, 2, 3];
+
+// Destructuring the array into variables
+let [a, b, c] = arr;
+
+console.log(a);  // Output: 1
+console.log(b);  // Output: 2
+console.log(c);  // Output: 3
+
+
+
+const user = {
+  name: 'Sarah',
+  age: 28,
+  address: {
+    city: 'New York',
+    zip: '10001'
+  }
+};
+
+*/
+
+const user = {
+ name: 'Sarah',
+ age: 28,
+ address: {
+city: 'New York',
+zip: '10001'
+ }
+};
+
+const{name ,age,address:{city}}=user
+
+console.log(name)
+console.log(age)
+console.log(city)
+
+
+/*
+
+const obj1 = {
+  user: {
+    name: 'Alice',
+    details: { age: 25, city: 'Delhi' }
+  }
+};
+ 
+const obj2 = {
+  user: {
+    details: { city: 'Mumbai', country: 'India' }
+  }
+};
+ 
+// Expected Output:
+{
+  user: {
+    name: 'Alice',
+    details: {
+      age: 25,
+      city: 'Mumbai',
+      country: 'India'
+    }
+  }
+}
+*/
+
+
+const obj3 = {
+ userone: {
+nameone: 'Alice',
+details: { ageone: 25, cityone: 'Delhi' }
+ }
+};
+
+const obj4 = {
+userone: {
+details: { cityone: 'Mumbai', country: 'India' }
+ }
+};
+
+
+
+
+
+const mgr={
+    ...obj3.userone,
+    
+    userone:{
+        ...obj3.userone.details,
+        ...obj4.userone.details
+    }
+};
+
+console.log(mgr)