added basics of array

Arrays Concept JavaScript/Basics_of_Array.js

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+// Array is an ordered list of values. Each element in the array is accessed using index.
+// There are two ways to create an array
+// First one is to use the Array constructor
+
+let marks = new Array(89, 78, 65, 77, 50);
+
+// Second method is to use the array literal notation
+let colors = ['Red', 'Blue', 'Green', 'Yellow'];
+
+// Accessing array elements
+console.log(colors[2]);
+colors[1] = 'Brown';
+console.log(colors);
+
+// We can also find the length of the array
+console.log(colors.length);
+
+// Adding element at the end
+colors.push('White');
+console.log(colors);
+
+// Adding element at the beginning
+colors.unshift('Pink');
+console.log(colors);
+
+// Removing element from the end
+colors.pop();
+console.log(colors);
+
+// Removing element from the beginning
+colors.shift();
+console.log(colors);
+
+// Finding index of a particular element
+let i = colors.indexOf('Brown');
+console.log(i);
+
+// Converting arrays to string
+console.log(colors.toString());
+
+// Deleting elements
+delete marks[0];
+console.log(marks);
+
+// Merging two arrays
+let merg = colors.concat(marks);
+console.log(merg)
+
+// Slicing an array
+let part1 = colors.slice(2);
+console.log(part1);
+let part2 = colors.slice(1, 3);
+console.log(part2);
+
+// Sorting an array
+console.log(marks.sort());
+
+// Reversing an array
+console.log(colors.reverse());
+
+// filter method creats a new array with array elements that passes a test
+let filter_arr = marks.filter(myFun);
+
+function myFun(value) {
+    return value > 70;
+}
+console.log(filter_arr);