Create comparisons.md

loops/comparisons.md

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+# Comparing the loops
+
+If you have read about the for and while loops, you will discover that a while loop is much the same as a for loop, with some minor differences.
+Let's see a sample case and write the for, while and do/while loops for the same case.
+
+Let's consider the following array:
+
+```javascript
+var cars = ["BMW", "Volvo", "Saab", "Ford"];
+```
+
+- ### For loop
+The loop in this example uses a for loop to collect the car `names` from the `cars` array in the `text` string:
+
+```javascript
+text = "";
+
+for(var i = 0; i < 4; i = i + 1){       // We use the condition `i<4` as we know `cars` has 4 objects
+  text = text + cars[i] + " ";          // Adds the name in the string and a space " " character after every name
+}
+
+cout<<text;
+
+
+// Output will be:
+// BMW Volvo Saab Ford
+```
+
+- ### While loop
+The loop in this example uses a while loop to collect the car `names` from the `cars` array in the `text` string:
+
+```javascript
+text = "";
+var i = 0;
+
+while(i<4){                             // We use the condition `i<4` as we know `cars` has 4 objects
+  text = text + cars[i] + " ";          // Adds the name in the string and a space " " character after every name
+  i++;
+}
+
+cout<<text;
+
+
+// Output will be:
+// BMW Volvo Saab Ford
+```
+
+- ### Do/While loop
+The loop in this example uses a while loop to collect the car `names` from the `cars` array in the `text` string:
+
+```javascript
+text = "";
+var i = 0;
+
+do {                            
+  text = text + cars[i] + " ";          // Adds the name in the string and a space " " character after every name
+  i++;
+} while(i<4)                            // We use the condition `i<4` as we know `cars` has 4 objects
+
+cout<<text;
+
+
+// Output will be:
+// BMW Volvo Saab Ford
+```