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All Statements
STATEMENT: for...in
for
(variable
in
object) {statements}
The
for...in
statement is used to iterate a declared variable over every property in a specified object. The code in the body of the
for ... in
loop is executed once for each property. The
variable
argument can be a named variable, an array element, or a property of the object.
This example simply displays the names of all the properties of the 'drink' object.
Code:
var i;
for(i in drink)
document.write(i + "<BR>");
You can also have a specified variable iterate over the values of an object's properties by placing it between square brackets after the object name. Expanding on the previous example, the following code displays both the name of each property in the 'drink' object and its value:
Code:
var i;
for(i in drink)
document.write(i + ": " + drink[i] + "<BR>");
It is very easy to loop through an array. In this last example, starname is the name of an array element in an array called, starchart.
Code:
for(starname in starchart)
document.write(starname + "<BR>");
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