day 3 javascripts interview

Author: nilajcoder

JavaScript Interview/Day 3/fun.js

@@ -0,0 +1,87 @@
+
+/*
+event propagession
+
+Capturing Phase: document → grandparent → parent → child.
+Target Phase: The event is processed at the child element.
+Bubbling Phase: child → parent → grandparent → document.
+
+
+
+
+1.  function abc() {
+    console.log(abc.xyz);
+}
+
+abc()//undefine
+abc.xyz = 400
+abc.xyz = 200
+abc()//200
+
+output 
+undefined
+200
+
+2. const numbers = [1, 2, 3, 4]
+numbers[100] = 500
+console.log(numbers)
+output 
+[ 1, 2, 3, 4, <96 empty items>, 500 ]
+
+3. console.log(typeof 10)//number
+console.log( typeof typeof 10)//String
+
+
+4. Spread operator (...)
+
+The spread operator expands an iterable (like a string, array, or object) into individual elements.
+const arr=[..."nilaj"];
+console.log(arr)
+
+output
+
+[ 'n', 'i', 'l', 'a', 'j' ]
+
+
+5. parseInt converts string into Number
+
+console.log(parseInt("10"))//10
+console.log(parseInt("N"))//Nan
+console.log(parseInt("Nil"))//NaN
+console.log(parseInt('10+2'))//10
+console.log(parseInt('7FM'))//7
+console.log(parseInt('M7F'))//NaN
+
+console.log(isNaN("nilaj"))//true
+console.log(NaN("nil"))//error
+
+
+
+
+6. console.log([1,2].map(num=>{
+    if(num>0) return ;
+    return num * 2
+}))
+
+output 
+undefined
+undefined
+
+
+7. {
+    function abc(){
+        console.log("hii")
+    }
+
+    
+}
+
+abc()
+
+
+ouput
+hii
+*/
+
+
+