javascript-problems-and-solutions | JavaScript problems and solutions for studying algorithms | Learning library
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kandi X-RAY | javascript-problems-and-solutions Summary
:trident: A collection of JavaScript problems and solutions for studying algorithms.
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QUESTION
I'm new to Javascript and thus this question, I understand arrow functions. However this syntax completely confuses me. This is an implementation of a PriorityQueue which takes a function comparator as a callback, this is the syntax,
...ANSWER
Answered 2019-Jan-16 at 03:57The constructor expects zero or one argument, which, if provided, should be an object.. If the argument is not provided, it defaults to an empty object. Then, it checks the (possibly empty) object for the properties comparator
and initialValues
. If those properties exist on the object, they are extracted into those variable names (comparator
and initialValues
) - otherwise, those variable names are assigned the default values, (a, b) => a - b
for comparator
and []
for initialValues
.
Eg
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