3/9/2024 0 Comments Javascript map vs reduce![]() filter won’t stop until it reaches a value that matches its callback. Also, it’s important to be careful when using filter. However, we could write a version of reduce that iteratively collapses values. There are a few potential ‘gotchas’ to be aware of: First, trying to call reduce on a generator that doesn’t stop would not work, since the reduce function would never run out of values to process. In this case all the numbers are added together to produce the final result of ‘30’. Now we can call the Array.reduce method, which collapses the array to a single value using the supplied callback. map will pass each of those numbers from the generator to the num=>num*3 callback, which will multiply each number by 3 before, in turn, passing the result back to take. This in turn will call next 4 times on the generator returned by numbers(). The take function will call next 4 times on the LazyMap object returned by map(num=>num*3). Prior to take being called, nothing will happen other than some objects getting created. log ( ' result = ' + result )įirst, let’s look at the take function. ![]()
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