Update 100_JS_Que

Author: priya42bagde

100Questions/100_JS_Que

@@ -1,3 +1,57 @@
+// Question: What is typeof []
+// Answer: Object. Actually Array is derived from Object. If you want to check array use Array.isArray(arr)
+
+// Question: What is typeof arguments
+// Answer: Object. arguments are array like but not array. it has length, can access by index but can't push pop, etc.
+
+// Question: What is the value of typeof null
+// Answer: "object"
+
+// Question: What is console.log(true+false)
+// Answer: 1 here true -->> 1 & false -->> 0 then 1 + 0 -->> 1
+
+// Question: What is 2+true
+// Answer: 3. The plus operator between a number and a boolean or two boolean will convert boolean to number. Hence, true converts to 1 and you get result of 2+1
+
+// Question: What is "2"+true
+// Answer: 2true here string concatination happer "2"+"true" -->> 2true
+
+// Question: What is the value of -'34'+10
+// Answer: -24. minus(-) in front of a string is an unary operator that will convert the string to a number and will make it negative. Hence, -'34' becomes, -34 and then plus (+) will perform simple addition as both the operands are number.
+
+// Question: What is the value of +'dude'
+// Answer: NaN. The plus (+) operator in front of a string is an unary operator that will try to convert the string to number. Here, JavaScript will fail to convert the "dude" to a number and will produce NaN.
+
+// Question: If you have var y = 1, x = y = typeof x; What is the value of x?
+// Answer: "undefined"
+
+// Question: for var a = (2, 3, 5); what is the value of a?
+// Answer: 5. The comma operator evaluates each of its operands (from left to right) and returns the value of the last operand. ref: MDN
+
+// Question: for var a = (1, 5 - 1) * 2 what is the value of a?
+// Answer: 8
+
+// Question: What is the value of !'bang'
+// Answer: false. ! is NOT.
+
+// Question: What is the value of parseFloat('12.3.4')
+// Answer: 12.3
+
+// Question: What is the value of Math.max([2,3,4,5]);
+// Answer: NaN
+
+// Question: typeof(NaN)
+// Anwser:"number"
+
+// Question:null == undefined
+// Answer: true
+
+// Question: If var a = 2, b =3 what would be value of a && b
+// Answer: 3
+
+// Question: What is -5%2
+// Answer:-1. the result of remainder always get the symbol of first operand
+======================================================================================================================================================================
 let a = [];
 let b = [];
 console.log(a==b); //false