CODEWITHSUNDEEP
javascript
Wizard
Wizard

Reputation: 22113

While loops finished but print all its variables

I am a little confused about the logics of while loop. Suppose such a minimal code:

var i = 1; // Set counter to 1
var msg = ''; // Message

// Store 5 times table in a variable
while (i < 10) {
  msg += i + ' x 5 = ' + (i * 5) + "\n";
  i++;
}
console.log(msg) // the console is placed out of {}

Run it and come by:

1 x 5 = 5
2 x 5 = 10
3 x 5 = 15
4 x 5 = 20
5 x 5 = 25
6 x 5 = 30
7 x 5 = 35
8 x 5 = 40
9 x 5 = 45

I guessed it would just output:

9 x 5 = 45

Because, the while loop stops on i = 9, and console.log(msg) is implemented after while loop finished since it is not within {},

However, the result is beyond my expectation. How to understand it?

Upvotes: 1

Views: 94

Answers (2)

Vikasdeep Singh
Vikasdeep Singh

Reputation: 21766

You msg is getting printed ONLY once but you are appending your each result to msg string in a formatted way i.e adding /n as well so that next result will print in new line.

So if you want to print only 9 x 5 = 45 then use below code:

  msg = i + ' x 5 = ' + (i * 5) + "\n";

Demo below: 

var i = 1; // Set counter to 1
var msg = ''; // Message

// Store 5 times table in a variable
while (i < 10) {
  msg = i + ' x 5 = ' + (i * 5) + "\n";
  i++;
}
console.log(msg) // the console is placed out of {}

If you want to print complete table then keep it as it is:

  msg += i + ' x 5 = ' + (i * 5) + "\n";

Demo below:

var i = 1; // Set counter to 1
var msg = ''; // Message

// Store 5 times table in a variable
while (i < 10) {
  msg += i + ' x 5 = ' + (i * 5) + "\n";
  i++;
}
console.log(msg) // the console is placed out of {}

Upvotes: 1

AshwinKumarS
AshwinKumarS

Reputation: 1313

msg += i + ' x 5 = ' + (i * 5) + "\n";

That line runs for every number and you are appending to string. The string kept on taking each line for 1-9 and finally when you did console.log, it dropped the whole string. Put a console.log inside while to see the string increasing in every loop. like 1, then 1,2 then 1,2,3 and so on.

Upvotes: 3

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