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α-wwwiki :: history/lambda/20130617-171540.txt

editor : alpha [82.248.206.120] 2013/06/17 17:15:40
_h1 lambda {span {@ style="font-size:0.6em;"}(see [[define]] and [[defun]])}

_p When a function has to be used once inline, anonymous functions make things easier.

{pre 
1) The square function is not defined in the lambdatalk's core. 
   It can be first created via the define operator and then used :
°°{define square (x) return x*x;}°° -> {define square (x) return x*x;}
°°{square 12}°° -> {square 12}
  And it can be created and used via the lambda operator :
°°{{lambda (x) return x*x;} 12}°° -> {{lambda (x) return x*x;} 12}

2) A lambda function can be mapped to a serie of values :
°°{map 
  {lambda (x) return x*x*x;} 
  {serie 1 10}
} 
°°-> {map 
  {lambda (x) return x*x*x;} 
  {serie 1 10}
}

3) Two ways to call Javascript Math functions :
   Via the define operator :
°°{define cos (x) return Math.cos(Math.PI/180*x);}°° -> {define cos (x) return Math.cos(Math.PI/180*x);}
°°{cos 45}°° -> {cos 45}
   Via the lambda operator :
°°{{lambda (x) return Math.cos(Math.PI/180*x);} 45}°° 
-> {{lambda (x) return Math.cos(Math.PI/180*x);} 45}

}
_p Yes, alphawiki doesn't forget ze lambdaway :) :)

_h3 alpha
_p The "define" and "defun" operators follow a similar syntax, the first using Javascript expressions, the last using lambdatalk expressions. In a similar way, beside the "lambda" operator using Javascript expressions exists an "alpha" operator using lambdatalk expressions. More to say later about that.

_h3 notes
_ul Some synonyms for lambda : anonymous, fleeting, in short, transitory, fugitive, furtive, reducing, temporary, moving, momentary.