Ring Documentation Walkthrough #10 – Check Data Types 1

Welcome to the chapter 10, you’ve made a lot of progress.

We will learn in this post five important functions for checking types of objects, and they’re :

  • isString() & isNumber()
    see isString('amr') #output: 1 (true)
    see isString(1) #output: 0 (false)
    see isNumber(1) #output: 1 (true)
    
  • isList()
    see isList( [1, 2, 3] ) #output: 1 (true)
    see isList( 'amr' ) #output: 0 (false)
    
  • isNull()
    x = ''
    see isNull(x) #output: 1 (true)
    see isNull('NULL') #output: 1 (true)
    see isNull(2) #output: 0 (false)
    see isNull( [1, 2, 3] ) #output: 0 (false)
    see isNull('Null') #output: 0 (false)
    
  • type()
    see type( 'amr' ) #output: STRING
    see type(1) #output: NUMBER
    see type( [1, 2, 3] ) #output: LIST
    see type('') #output: STRING
    see type('NULL') #output: STRING
    see type(true) #output: NUMBER, because true equals 1
    see type(false) #output: NUMBER, because false equals 0
    

Will be continued in the next post …

amrESSAM.

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