JavaScript Statement: for
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In JavaScript,
the for statement identifies
a block of statements that are to be executed whilst a condition is true (and a
break or to some extent a continue statement have not been
triggered).
For example, statements
such as:
var sumi = 0;
var i;
for (i = 1; i <= 5; i++) {sumi = sumi + i}
will loop through from i=1 to i=5
and calculate the sum (i.e. 1+2+3+4+5 = 15)
EXAMPLE:
HTML USED IN THIS EXAMPLE:
<!DOCTYPE html>
<html> <!-- Copyright (c) Nematrian Limited 2018 -->
<head>
<style>
table,th,tr,td {border: 1px solid black; border-collapse: collapse;}
</style>
</head>
<body>
<table>
<tr>
<th>Example</th>
<th>Resulting value of <code>x</code></th>
</tr>
<tr>
<td><code id="Example"></code></td>
<td><code id="Result"></code></td>
</tr>
</table>
<script>
document.getElementById("Example").innerHTML =
'var i; var x = 0;<br>' +
'for (i=1; i<=4; i++) {<br>' +
' x = x + i<br>' +
'}';
var i; var x = 0;
for (i=1; i<=4; i++) {
x = x + i
}
document.getElementById("Result").innerHTML = x;
</script>
</body>
</html>
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