I agree with the author that performance optimizations for the vast majority of the code we're writing are usually not addressing significant bottlenecks, but t

I agree with the author that performance optimizations for the vast majority of the code we're writing are usually not addressing significant bottlenecks, but they should still include benchmarks. I put them here: https://jsperf.com/advancedweb-test/1 https://jsperf.com/advancedweb-test/1 The for loop executes 20.64x faster in V8. Again, I think that iterator functions are great and should definitely be used, but it's important to know the cost.