Setting breakpoints
Factor handbook > UI developer tools > UI walker

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In addition to invoking the walker explicitly through the UI, it is possible to set breakpoints on words using words in the tools.walker vocabulary.

Annotating a word with a breakpoint (see Word annotations):
breakpoint ( word -- )

breakpoint-if ( word quot -- )


Breakpoints can be inserted directly into code:
break ( -- )

B

B:


Note that because the walker calls various core library and UI words while rendering its own user interface, setting a breakpoint on a word such as append or + will hang the UI.