Statements are core to the JavaScript language. This section includes new statements and changed statements.

break

The break statement can now include an optional label that allows the program to break out of a labeled statement. This type of break must be in a statement identified by the label used by break.

Syntax

break label

Argument

label is the identifier associated with the label of the statement.

Example

In the following example, a statement labeled checkiandj contains a statement labeled checkj. If break is encountered, the program breaks out of the checkj statement and continues with the remainder of the checkiandj statement. If break had a label of checkiandj, the program would break out of the checkiandj statement and continue at the statement following checkiandj.

checkiandj : 
   if (4==i) { 
      document.write("You've entered " + i + ".<BR>");
      checkj : 
         if (2==j) {
            document.write("You've entered " + j + ".<BR>"); 
            break checkj; 
            document.write("The sum is " + (i+j) + ".<BR>"); 
         } 
      document.write(i + "-" + j + "=" + (i-j) + ".<BR>"); 
   }

See Also

continue

The continue statement can now include an optional label that allows the program to terminate execution of a labeled statement and continue to the specified labeled statement. This type of continue must be in a looping statement identified by the label used by continue.

Syntax

continue label

Argument

label is the identifier associated with the label of the statement.

Example

In the following example, a statement labeled checkiandj contains a statement labeled checkj. If continue is encountered, the program continues at the top of the checkj statement. Each time continue is encountered, checkj re-iterates until its condition returns false. When false is returned, the remainder of the checkiandj statement is completed. checkiandj re-iterates until its condition returns false. When false is returned, the program continues at the statement following checkiandj.

checkiandj : 
   while (i<4) {
      document.write(i + "<BR>"); 
      i+=1; 
      checkj : 
         while (j>4) {
            document.write(j + "<BR>"); 
            j-=1; 
            if ((j%2)==0);
               continue checkj; 
            document.write(j + " is odd.<BR>");
         } 
      document.write("i = " + i + "<br>");
      document.write("j = " + j + "<br>");  
   }

See Also

do while

The do while statement executes its statements until the test condition evaluates to false. Statement is executed at least once.

Syntax

do 
   statement
while (condition);

Arguments

statement is a block of statements that is executed at least once and is re-executed each time the condition evaluates to true.

Example

In the following example, the do loop iterates at least once and re-iterates until i is no longer less than 5.

do {
   i+=1
   document.write(i);
   } while (i<5);

export

The export statement allows a signed script to provide functions objects to other signed or unsigned scripts.

Syntax

export name1, name2, ..., nameN
export *

Parameters

nameN is a list of functions to be exported.

Description

See Also

import

The import statement allows a script to import functions from a signed script which has exported the information.

Syntax

import objectName.name1, objectName.name2, ..., objectName.nameN
import objectName.*

Parameters

nameN is a list of functions to import from the export file.

import obj.f, obj.p

will make f and p accessible in the importing script as properties of obj.

Description

See Also

labeled

A labeled statement provides an identifier that can be used with break or continue to indicate where the program should continue execution.

Syntax

label :
   statement

Arguments

statement is a block of statements. break can be used with any labeled statement, and continue can be used with looping labeled statements.

Example

See Also

switch

A switch statement allows a program to evaluate an expression and attempt to match the expression's value to a case label. If a match is found, the program executes the associated statement.

Syntax

switch (expression){
         case label : 
              statement;
              break;
         case label : 
              statement;
              break;
         ...
         default : statement;
}

Arguments

expression is the value matched against label.

Example

In the following example, if expression evaluates to "Bananas", the program matches the value with case "Bananas" and executes the associated statement. When break is encountered, the program breaks out of switch and executes the statement following switch. If break were omitted, the statement for case "Cherries" would also be executed.

switch (i) { 
   case "Oranges" : 
      document.write("Oranges are $0.59 a pound.<BR>"); 
      break; 
   case "Apples" : 
      document.write("Apples are $0.32 a pound.<BR>"); 
      break; 
   case "Bananas" : 
      document.write("Bananas are $0.48 a pound.<BR>"); 
      break; 
   case "Cherries" : 
      document.write("Cherries are $3.00 a pound.<BR>"); 
      break; 
   default : 
      document.write("Sorry, we are out of " + i + ".<BR>"); 
   } 

document.write("Is there anything else you'd like?<BR>");