d3wordcloud | : cloud : htmlwidgets for D3js Word Cloud Layout | Data Visualization library
kandi X-RAY | d3wordcloud Summary
kandi X-RAY | d3wordcloud Summary
:cloud: htmlwidgets for D3js Word Cloud Layout
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QUESTION
I came across this spinet of code where the function rval_top_ingredients()
was used to render a D3wordcloud before it was defined. I think that would throw an error in case of Python as the script is executed from top to bottom. Why did it work in R then? Thankyou.
ANSWER
Answered 2020-Dec-01 at 11:12R doesn’t differ from Python here: you can’t use a function before it’s defined. But, despite appearances to the contrary, this also isn’t happening here.
d3wordcloud::renderD3wordcloud
is a special function call which doesn’t evaluate its arguments immediately. In fact, the argument is stored internally as an unevaluated expression and is only evaluated later after a certain trigger. By that time, rval_top_ingredients
has been defined.
This is a pervasive pattern in Shiny, but you can harness this behaviour yourself. Consider the following:
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