12 lines
376 B
Text
12 lines
376 B
Text
# Input: an object
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# Output: the updated object with .emit filled in from `update|emit`.
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# `emit` may produce a stream of values, which need not be strings.
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def observe(update; emit):
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def s(stream): reduce stream as $_ (null;
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if $_ == null then .
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elif . == null then "\($_)"
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else . + "\n\($_)"
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end);
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.emit as $x
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| update
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| .emit = s($x // null, emit);
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