IsCharacter

This phrase returns a Boolean 1 depending on the type of the simple, non-mixed array.

      ' '=↑1↑0⍴SA

Examples

Add proper examples here, and don't forget to fix a sample function changing "PhraseName" accordingly

      ⎕FX ⍕2 1⍴'r←IsCharacter y' 'r←'' ''=↑1↑0⍴y'  
      IsCharacter¨'a' 1
1 0

How not to do it!

In Dyalog, there is a system function ⎕DR available which returns the data type of its argument. Albeit being useful on any non-char types, there is no reason to use it in order to determine whether a simple, non-mixed array is of type Char or not. In the Unicode version of Dyalog ⎕DR started to return 80 for a character variable rather than 82. The phrase returns a 1 in both, the Classic and the Unicode version.

Compatibility

Checked with: APL2, APLX, Dyalog, NARS2000 APL+Win

Test Cases

Replace "PhraseName" accordingly Show Hide test cases test cases

Test
 ⎕IO←0      ⍝ You may change this; however, zero IS the default in the Phrasebook
 ⎕FX'r←IsCharacter y' 'r←'' ''=↑1↑0⍴y'
⍝ ---- Start Test cases (do not delete this!)
 1 ≡ IsCharacter ''
 0 ≡ IsCharacter ⍳0
 1 ≡ IsCharacter 'abc'
 0 ≡ IsCharacter (1 2 3)

Test my code, both Examples and Test Cases.

Mentor: KaiJaeger Replace by your name

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