cmp is a funtion is a function to compare your keys to determine ordering.
The function will take two of your key type (whatever that will be) and
cmp(a,b), it returns
a < b,
a == b and
a > b.
Number of entries in tree.
key:value pair. It will over-write a pre-existed entry for
undefined if the key was not found. However, you could
undefined as the value of a
key:value pair. Try not to do
that as it lessens the effectivity of this method.
Returns a boolean;
true if deleted,
To run tests:
To run test coverage:
npm run-script test-cov open jscov.html