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Predicate js_script/2
Sourcejs_script(+String, +Options)
Evaluate String as JavaScript. This is designed to cooperate with string quasi quotations, so we can write e.g., 
:- use_module(library(strings)).
:- js_script({|string||
function myfunc(a)
...
|}).

The implementation uses =:/2, calling the JavaScript function eval().

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