Contents [hide]
Output
value is not defined
Code examples
JavaScript
1 2 3 4 5 | if ( typeof value !== 'undefined' ) { console.log( 'value is defined' ); } else { console.log( 'value is not defined' ); } |
PHP
1 2 3 4 5 6 7 | <?php if (isset( $value )) { print "value is defined\n" ; } else { print "value is not defined\n" ; } |
Perl
1 2 3 4 5 6 | if ( defined ( $value )) { print "value is defined\n" ; } else { print "value is not defined\n" ; } |
Python
1 2 3 4 5 6 | try : value except NameError: print ( "value is not defined" ) else : print ( "value is defined" ) |
Ruby
1 2 3 4 5 | if defined ? value puts "value is defined" else puts "value is not defined" end |
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Author: Hajime Kurita, CEO/CTO of 1st Class, inc. Search Engineer & Web master
Certificate: AWS SOL Architect, Professional Scrum Master I, Class I IT Engineer(JP national certificate), TOEIC900+, Graduate of Tokyo university
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