Loop

Loops are used to execute a block of code a number of times.

A for loop runs from a start value to an end value. It's usually used to loop through every value in an array.

for (Start;Condition;Increment){
}

Example:

var Text="7 times table.\r\n";
for (var i=1;i<=12;i++){
Text+=i+" x 7 = "+(i*7)+"\r\n";
}
alert(Text);

A while loop is used when you don't know how many times the loop should run. It continues only if a condition is met.

while(Value){
}

Example:

var i=1;
var Text="7 times table.\r\n";
while(i<=12){
Text+=i+" x 7 = "+(i*7)+"\r\n";
i++;
}
alert(Text);

A do...while loop is used when you don't know how many times the loop should run. It continues only if a condition is met. Unlike a while loop, it runs once before any conditions are tested.

do{
}while(Value);

Example:

var i=1;
var Text="7 times table.\r\n";
do{
Text+=i+" x 7 = "+(i*7)+"\r\n";
i++;
}while(i<=12);
alert(Text);

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