Day 32: Arrow vs regular, This keyword

javascript/Day32/index.js

@@ -0,0 +1,92 @@
+// Question 1:
+// Write a program to search if a number exists in an array.
+// If the number exists then return the position.
+// If it exists multiple time then return an array with all the positions.
+// If the number doesn't exist then return -1;
+// For example,
+// Input: [1, 2, 3, 4, 5, 1, 3] and Search Elem: 4
+// Output: 3
+// Input: [1, 2, 3, 4, 5, 1, 3] and Search Elem: 1
+// Output: [0, 5]
+// Input: [1, 2, 3, 4, 5, 1, 3] and Search Elem: 7
+// Output: -1
+
+function findNumber(array, num) {
+  let positions = [];
+  for (let i = 0; i < array.length; i++) {
+    if (array[i] === num) {
+      positions.push(i);
+    }
+  }
+  const length = positions.length;
+  if (length === 0) {
+    return -1;
+  } else if (length === 1) {
+    return positions[0];
+  }
+  return positions;
+}
+
+let arr = [1, 2, 3, 4, 5, 6, 7, 4, 2, 3, 5, 2];
+const position = findNumber(arr, 10);
+console.log(position);
+
+for (let i = 0; i < 5; i++) {
+  let str = "";
+  for (let j = i; j < 5; j++) {
+    str += "*";
+  }
+  console.log(str);
+}
+// *****
+// ****
+// ***
+// **
+// *
+
+let newStr = "";
+for (let i = str.length - 1; i >= 0; i--) {
+  newStr += str[i];
+}
+//reverse logic
+
+let my_function = (a, b) => a + b;
+const arrFun = (...args) => {
+  console.log(args);
+};
+
+let obj = {
+  name: "Utkarsh",
+  getName: function () {
+    //   console.log(this)//obj
+    const my_function = () => {
+      console.log(this); //obj
+    };
+    my_function();
+  },
+};
+
+obj.getName();
+
+obj = {
+  name: "Utkarsh",
+  getName: () => {
+    console.log(this); //window
+  },
+};
+
+obj.getName();
+
+function abc() {
+  console.log("hello");
+}
+
+const obj3 = new abc();
+console.log(obj3);
+
+const xyz = () => {
+  console.log("Bye");
+};
+
+const obj2 = new xyz();
+console.log(obj2);