while ( ..a pred: ( ..a -- ..b ? ) body: ( ..b -- ..a ) -- ..b )
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until ( ..a pred: ( ..a -- ..b ? ) body: ( ..b -- ..a ) -- ..b )

Vocabulary
kernel

Inputs

pred	a quotation with stack effect ( ..a -- ..b ? )
body	a quotation with stack effect ( ..b -- ..a )

Outputs
None

Word description
Calls body until pred returns f.

Definition

IN: kernel

: while
    ( ..a pred: ( ..a -- ..b ? ) body: ( ..b -- ..a ) -- ..b )
    swap do compose [ loop ] curry when ; inline