JavaScript For…In Statement
The for…in statement is used to loop (iterate) through the elements of an array or through the properties of an object. The for…in statement iterates a specified variable over all the properties of an object. For each distinct property, JavaScript executes the specified statements. A for…in statement looks as follows:
Syntax
for (variable in object)
{
code to be executed
}
{
code to be executed
}
Note: The code in the body of the for…in loop is executed once for each property.
Example
Looping through the properties of an object:
var person={fname:”Ali”,lname:”Dua”,age:25};
for (x in person)
{
document.write(person[x] + ” “);
}
Output
Ali Dua 25
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