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closure.js
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20 lines (18 loc) · 942 Bytes
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function counterFactory() {
// Return an object that has two methods called `increment` and `decrement`.
// `increment` should increment a counter variable in closure scope and return it.
// `decrement` should decrement the counter variable and return it.
}
function limitFunctionCallCount(cb, n) {
// Should return a function that invokes `cb`.
// The returned function should only allow `cb` to be invoked `n` times.
// Returning null is acceptable if cb can't be returned
}
function cacheFunction(cb) {
// Should return a funciton that invokes `cb`.
// A cache (object) should be kept in closure scope.
// The cache should keep track of all arguments have been used to invoke this function.
// If the returned function is invoked with arguments that it has already seen
// then it should return the cached result and not invoke `cb` again.
// `cb` should only ever be invoked once for a given set of arguments.
}