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What is the difference between for...of and for...in statements in JavaScript?
for…in loop
The “for...in” loop is used to loop through an object's properties.
Here’s the syntax −
Syntax
for (variablename in object) { statement or block to execute } You can try to run the following example to implement ‘for-in’ loop. It prints the web browser’s Navigator object
Example
<html> <body> <script> var aProperty; document.write("Navigator Object Properties<br /> "); for (aProperty in navigator) { document.write(aProperty); document.write("<br />"); } document.write ("Exiting from the loop!"); </script> </body> </html> for…of loop
The “for…of” loop is used to loop through iterable objects, which includes Map, Array, arguments, etc.
Syntax
Here’s the syntax −
for (variablename of iterable){ statement or block to execute } Example
Here’s an example showing iteration with for…of loop
<!DOCTYPE html> <html> <body> <script> let itObj= [20, 30, 40, 50]; for (let res of itObj) { res += 1; document.write("<br>"+res); } </script> </body> </html> Output
21 31 41 51
Updated on: 2020-06-15T12:16:31+05:30
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