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KaarthiikM · web-flow · commit d66c5c55aaed · 2023-08-20T18:53:02.000+05:30
diff --git a/JSprogram/Day5/Listmanipulation2.js b/JSprogram/Day5/Listmanipulation2.js
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+//Program to remove duplicates from a list
+
+let list1 = [3,63,24,3,72,3,24]
+console.log( [...new Set(list1)])//[ 3, 63, 24, 72 ] Here we using spread operator(...) and set method to remove duplicate elements
+console.log(new Set(list1))//Set(4) { 3, 63, 24, 72 }
+
+//another way
+const originalArray = [1, 2, 2, 3, 4, 4, 5];
+const uniqueArray = [];
+
+for (const item of originalArray) {
+  if (!uniqueArray.includes(item)) {
+    uniqueArray.push(item);
+  }
+}
+
+console.log(uniqueArray); // Output: [1, 2, 3, 4, 5]
+
+// Write a program to check if a list is empty.
+
+!list1?console.log("list is empty") : console.log("list is not empty")  //list is not empty
+if(list1) console.log("list is not empty")
+else console.log("list is empty") // list is not empty
+
+// Write a program to concatenate two lists.
+
+const shiro = [4,26,73,34]
+let newlist = list1.concat(shiro); // concat is a method use to concatenate two arrays
+console.log(newlist);
+//or
+console.log([...list1,...shiro])
+
+// Write a program to count the number of occurrences of an element in a list.
+
+let elementtocount = 3; // here we giving 3 to know how many 3's occur in the array
+let count = 0;
+for(let i=0;i<list1.length;i++){
+    if(list1[i] === elementtocount){
+        count++
+    }
+}
+console.log(count);
