Added Splice-Slice

JavaScript_Basics/splice-slice.js

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+//###########
+// SPLICE #
+//###########
+
+
+//Splice is used to add and delete new elements at specific index in an array.
+
+//Example:1 Adding an element at specific index using splice
+
+let languages = ["C++", "Java", "Javascript", "R"];
+languages.splice(2, 0, "Python", "Pearl"); //This will add Python and Perl starting at index 2
+//Output: ["C++", "Java", "Python", "Pearl", "Javascript", "R"]
+
+//Note: First argument denotes the Index of Array while second denotes the number of elements we want to delete from the array.
+
+
+//Example:2 Deleting and Adding an element at specific index using splice 
+
+let languages = ["C++", "Java", "Javascript", "R"];
+languages.splice(2, 1, "Python", "Pearl"); //This will add Python and Perl starting at index 2 and delete one element which was at index 2 originally.
+//Output: ["C++", "Java", "Python", "Pearl", "R"]
+
+//Example:3 Deleting an element at specific index using splice 
+
+let languages = ["C++", "Java", "Javascript", "R"];
+languages.splice(1, 1); //This will delete one element at index 1
+//Output: ["C++", "Javascript", "R"]
+
+//###########
+// SLICE #
+//###########
+
+//Slice is used to return a selected number of elements from an array depending on their index.
+
+let languages = ["C++", "Java", "Javascript", "R"];
+let coding = languages.slice(1, 2);
+//Output: ["Java", "Javascript"]
+
+//Note: First arguments denotes the start index and the second denotes the end index of the array to be fetched.
+let languages = ["C++", "Java", "Javascript", "R"];
+let coding = languages.slice(-3, -1);
+//Output: ["Java", "Javascript"]
+
+//Explaination:
+// index-> 0 1 2 3
+// ["C++", "Java", "Javascript", "R"]
+// -4 -3 -2 -1
+//
+// Slice excludes the last index when its negative. Hence, it will return elements at -3 and -2, ignoring element at -1.

docs/JavaScript_Basics/looping-an-object.md

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+# Looping an object

docs/JavaScript_Basics/splice-slice.md

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+# Splice and Slice