Merge pull request #94 from wakidurrahman/docs/javascript-001

docs: question and answer

Author: wakidurrahman

docs/interview-questions.md

@@ -0,0 +1,53 @@
+# Theoretical Questions
+
+`Q001:` What is typeof Operator?
+
+Answer: JavaScript provides a `typeof` operator that can examine a value tell you what type is is:
+
+```
+
+let a;
+typeof a; // 'undefined'
+
+a = "hello world";
+typeof a; // "string";
+
+
+a = 44;
+typeof a; // "number"
+
+a = null;
+typeof a; // 'object'
+
+a = true;
+typeof a; // "boolean";
+
+a = undefined;
+typeof a; // "undefined";
+
+a = { b: 'c'};
+typeof a; // "object"
+
+
+```
+
+`Q002:` What is the `object` type?
+
+Answer: The `object` type refers to a compound value where you can set properties(named locations) that each hold their own values of any type.
+
+```
+const obj = {
+  a: 'Hello World" ,
+  b: 42,
+  c: true
+};
+
+obj.a;
+obj.b;
+obj.c;
+
+obj['a'];
+obj['b'];
+obj['c'];
+
+```