Added Question 94 and 95

Author: surbhidighe

README.md

@@ -110,6 +110,8 @@ Every contribution counts, regardless of its size. I value and appreciate the ef
 | 91 | [Does JavaScript support automatic type conversion](#91-does-javascript-support-automatic-type-conversion) |
 | 92 | [What is variable shadowing in javascript](#92-what-is-variable-shadowing-in-javascript) |
 | 93 | [What is ternary operator](#93-what-is-ternary-operator) |
+| 94 | [Difference between Sparse array and Dense array](#94-difference-between-sparse-array-and-dense-array) |
+| 95 | [How does the length property behave in dense vs sparse arrays in JavaScript](#95-how-does-the-length-property-behave-in-dense-vs-sparse-arrays-in-javascript) |
 
 ### 1. What is JavaScript
 * JavaScript is a scripting language used to create dynamic and interactive websites. It is supported by all major web browsers.
@@ -1368,3 +1370,35 @@ console.log(result);	// output ========> output 1
 
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+### 94. Difference between Sparse array and Dense array
+**Sparse Array** - An array that has "holes" i.e some indices are unassigned or missing.
+```js
+const sparse = [1, , 3]; // index 1 is empty
+```
+**Dense Array** - An array where every index has an assigned value, with no gaps.
+```js
+const dense = [1, 2, 3];
+```
+
+**[:top: Scroll to Top](#javascript-interview-questions)**
+
+### 95. How does the length property behave in dense vs sparse arrays in Javascript
+**Sparse Array** - "length" is highest index + 1, even if some spots are empty.
+```js
+const sparse = [1, , 3];
+console.log(sparse.length); // output ========> 3
+
+OR
+
+const arr = [];
+arr[100] = 5; 
+console.log(arr.length); // output ========> 101 (index 100 has the value 5, while indices 0–99 are empty)
+
+```
+**Dense Array** - "length" equals the number of elements.
+```js
+const dense = [1, 2, 3];
+console.log(dense.length); // output ========> 3
+```
+
+**[:top: Scroll to Top](#javascript-interview-questions)**