Created a few benchmarks to measure the performance of typecasting inside of if-statements in JavaScript: - https://jsperf.com/checking-for-null-or-undefined … - https://jsperf.com/false-boolean-casting-vs-strict-boolean-check … - https://jsperf.com/true-boolean-casting-vs-strict-boolean-check …
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I’ve seen cases where a difference in a if-check (casting to boolean vs actual checks) would inhibit a function to be inlined, causing a 8-10% loss.
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I got false positives for optimization on some browser engines in 2011-2012 most interesting of which was putting code in the else block got better results. I did a lot of silly stuff then ;)
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JavaScript, HTML, CSS, HTTP, performance, security, Bash, Unicode, i18n, macOS.