Day 7 js interview

Author: nilajcoder

JavaScript Interview/Day 7/demo.js

@@ -0,0 +1,55 @@
+/*
+
+
+1. const myFn = () => {
+    console.log("hi");
+  }
+  
+  myFn() // hi
+
+2.    function abc(a, b) {
+    "use strict"
+    let a = 100, b = 200
+    return arguments[0] + arguments[1]
+    console.log(a + b)
+}
+
+console.log(abc(10, 20))// error
+
+use strict is used to avoid the use of undeclared variables.
+  
+
+
+3.  
+var abc = 10;
+let xyz = 20;
+
+console.log(window.abc, window.xyz); // error because abc is not defined in window object but xyz is defined in window object
+                                         // window object is a global object in browser environment
+                                         //   purpose of window object is to store global variables and functions
+
+
+
+4. 
+ console.log(null == undefined); // true because both are equal in value null is equal to undefined
+console.log(null === undefined); // false because both are not equal in type undefind type is undefined and null type is object.
+
+console.log(NaN == NaN); // false because nan is false in value and type is number
+console.log(NaN === NaN); // false because nan is false in value and type is number
+
+5. 
+const str = "hello world";
+const formattedStr = str.replace(" ", "\n");
+console.log(formattedStr); // hello  world because replace method only replace first occurance of the string in the string
+                            
+
+
+6.  console.log(isNaN("fardeen")); // true because fardeen is not a number 
+ console.log(!'fardeen'); // false because fardeen is a string
+console.log(+false); // 0 because false is equal to 0
+
+  */
+
+                            
+
+