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missing or null value, that value would be added to the total variable, resulting in a
null total. One way to fix this problem would be to use the continue statement, jump-
ing out of the current iteration if a missing or null value were encountered. The revised
code would look like the following:
var total = 0;
for (var i = 0; i < data.length; i++) {
if (data[i] == null) continue; // continue with the next
total += data[i];
Exploring Statement Labels
statement labels are used to identify statements in JavaScript code so that you can refer-
ence those lines elsewhere in a program. The syntax of the statement label is
label : statements
where label is the text of the label and statements is the statements identified by the
label. You've already seen labels with the switch statement, but they also can be used
with other program loops and conditional statements to provide more control over how
statements are processed. Labels often are used with break and continue statements
in order to break off or continue a program loop. The syntax to reference a label in such
cases is simply
break label ;
continue label ;
For example, the following for loop uses a statement label not only to jump out
of the programming loop when the text string Valdez is found, but also to jump to the
location in the script identified by the next_report label and to continue to process the
statements found there:
for (var i = 0; i < names.length; i++) {
if (names[i] == “Valdez”) {
document.write(“Valdez is in the list”);
break next_report;
JavaScript statements
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