day 4 javascripts interview

Author: nilajcoder

JavaScript Interview/Day 4/demo.js

@@ -0,0 +1,51 @@
+/*
+
+Array(2):
+
+When you pass a single numeric argument to the Array constructor, it creates an array 
+with that length but does not initialize the elements. The array will have "empty slots."
+Example: Array(2) creates an array with a length of 2, 
+but it has no values, resulting in [ , ]. These "empty slots" are different from undefined.
+
+
+1.
+console.log(Array(1, 2));  // [1, 2]
+console.log(Array(2));     // [ , ]
+
+
+2.
+console.log(typeof(NaN))
+console.log(NaN)
+console.log(NaN==4)
+console.log(NaN=="4")
+console.log(NaN!=4)
+console.log(NaN==true)
+console.log(NaN==false)
+
+output
+
+number
+NaN
+false
+false
+true
+false
+false
+
+
+In JavaScript, NaN stands for "Not-a-Number," 
+and it is a special value used to represent invalid or undefined numerical
+ results. The key point here is that NaN is a falsy value
+
+
+ 3. if (NaN) {
+    console.log("i am there")
+} else {
+    console.log("i am not there")
+}
+
+output
+i am not there
+*/
+
+