Editing Generator (computer programming) (section)

===Smalltalk===

Example in [[Pharo|Pharo Smalltalk]]:

The [[Golden ratio]] generator below returns to each invocation 'goldenRatio next' a better approximation to the Golden Ratio. 

<syntaxhighlight lang="Smalltalk">
goldenRatio := Generator on: [ :g | | x y z r | 
	x := 0.
	y := 1.
	[  
		z := x + y.
		r := (z / y) asFloat.
		x := y.
		y := z.
		g yield: r
	] repeat	
].

goldenRatio next.
</syntaxhighlight>

The expression below returns the next 10 approximations.

<syntaxhighlight lang="Smalltalk">
Character cr join: ((1 to: 10) collect: [ :dummy | ratio next ]).
</syntaxhighlight>

See more in [https://medium.com/concerning-pharo/pharos-hidden-gem-generator-c51ef88aec26 A hidden gem in Pharo: Generator].