Why this variable has to be equal to quotation marks?

Forums: Javascript, Java, Web Design
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Here is an easy question I hope Smile

Could you explain to me why there has to be this variable “theRoots” and it has to be equal to quotation marks so the result can be achived. Why should there be this line at all: result=result+"Square root of "+x+" is "+number+"\n"
I tried to write in the alert like this: alert ("Square root of "+x+" is "+number+"\n"); but it doesn’t work.

<html>
<head>
<title></title>

<script type="text/javascript">

function mySquareRoot()
{
the Roots="";
for (var x=0; x<20;x++)
{
number=Math.sqrt(x);
number=number*10;
number=Math.round(number);
number=number/10;
theRoots=theRoots+"Square root of "+x+" is "+number+"\n"
}
alert (theRoots);
}
</script>

</head>
<body>

<a href="javascript:mySquareRoot()">Click here</a>

</body>
</html>

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Type: Question • Score: 0 • Views: 2,263 • Replies: 1

[+3] - contrex - 11/10/2011It makes the code in the loop simpler. First you set the variable theRoots (note no space in the variable name!) equal to an empty string. This is what "" means. A zero length string....

@maniuni,

It makes the code in the loop simpler.

First you set the variable theRoots (note no space in the variable name!) equal to an empty string. This is what "" means. A zero length string. Then in the loop you append further strings, each terminated by a \n (carriage return) to what started out as an empty string.

Thus we avoid having to decide between creating the string if we are on the first pass or appending to it on subsequent passes.

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Why this variable has to be equal to quotation marks?

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