m (link change) (canned edit summary)
m
Line 17: Line 17:
 
switch costume to [bunny v]
 
switch costume to [bunny v]
 
ask [What's this animal?] and wait
 
ask [What's this animal?] and wait
if <(answer) contains [bunny] :: operators> then // contains is used instead of = because the user might say "it's a bunny"
+
if <(answer) contains [bunny] :: operators> then // the contains block is used instead of equal to because the user might say "it's a bunny"
 
   say [Correct!]
 
   say [Correct!]
 
else
 
else

Revision as of 20:46, 18 September 2018

Clock.png This article or section contains information about a feature from a future version of Scratch that is unreleased and is subject to change. Please cite any additional info in order to prevent speculation.
Document stub.png This article is a stub. It may be incomplete, unfinished, or have missing parts/sections. If the article can be expanded, please do so! There may be suggestions on its talk page. (August 2017)
This article is about the operators block to be released in Scratch 3.0. For the current lists block, see () Contains ()? (List block).
() Contains ()
X contains y 3.0.png
Category Operators
Type Boolean

The () Contains () block is an Operators block and a Boolean block. The block checks if the first parameter's text contains the second parameter's text—if it does, the block reports true; otherwise, it reports false, and this is case-insensitive. This block will be released with Scratch 3.0.[1]

Example Use

Checking whether input contains a certain string - useful for soft-checking as the actual input may not be exactly identical:

when gf clicked
switch costume to [bunny v]
ask [What's this animal?] and wait
if <(answer) contains [bunny] :: operators> then // the contains block is used instead of equal to because the user might say "it's a bunny"
  say [Correct!]
else
  say [Nope!]
end

Workaround

Main article: List of Block Workarounds
define (string1) contains (string2)
set [i v] to [0]
set [j v] to [1]
repeat (length of (string1))
  change [i v] by (1)
  if <(letter (i) of (string1)) = (letter (j) of (string2))> then
    set [j v] to [1]
    repeat until <<not <(letter ((i) + (j)) of (string1)) = (letter (j) of (string2))>> or <(j) > (length of (string2))>>
      change [j v] by (1)
    end
    if <(j) > (length of (string2))> then
      set [result v] to [true]
      stop [this script v]
    end
  end
end

References

  1. thisandagain. (10/8/2017). 'Blocks - implement "[string] contains [string]" reporter.[title]' https://github.com/LLK/scratch-gui/issues/601