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+### Square The Data
+
+Pass an array of integers you want to sqaure it
+Here using `.reduce()` the new object is accumulator and one by one values from array are passed and go through function.
+
+```
+const arr = [1,2,3,4,5,6,7];
+arr.reduce(function(a,b){
+a[b] = b * b;
+return a;
+},{}) // {1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6: 36, 7: 49}
+// 
+callback	accumulator	currentValue	currentIndex	array	           return value
+first call	1	              1		        0        [0, 1, 2, 3, 4]	  1
+second call	2	              2		        1        [0, 1, 2, 3, 4]	  4
+third call	3	              3		        2        [0, 1, 2, 3, 4]	  9
+...
+```