Looping structures: looping structures are used to execute the statements number of times. Depends on a condition javascript supports 4 types of looping structures. They are
- While
- Do-while
- For
- For-in
While: It is used to execute the statement n number of times depends on a condition.
Syntax:
inilization;
while(conditiom)
{
statements;
inc/dec;
}
Example:
document.write(‘<select>’);
document.write(‘<option>Data</option>’);
var i=1;
while(i<=30)
{
document.write(‘<option>’+i+’</option>’);
i++;
}
document.write<’</select>’);
Do-while: It prints the statement first and verify the condition next.
Syntax:
inilization;
do
{
statements;
inc/dec;
}while(condition)
Example:
document.write(‘<ul>’);
var j=1;
do
{
document.write(“<li>”+j+”</li>”);
j++;
}
while(j<=10)
document.write(‘</ul>’);
For: it is also similar to while loop.
Syntax:
for(nilization;condition;INC/DEC)
{
//ststements;
}
Example:
document.write(“<table.border=’1’>”);
for(k=1900;k<=2014;k++)
{
document.write(‘<tr>’>);
document.write(“<td>”+k+”</td>”);
document.write(‘</tr>’);
}
document.write(‘</table>’);
For-in: It is used to print only arrays.
Syntax:
for(variable in array)
{
document.write(array[variable]);
}
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