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This benchmark demonstrates how to optimize list iteration speed in almost all majorJS engines by tweaking the internal runtime representation.

As for right now, the expressionlet myList = ["a", "b", "c"] is compiled tofollowing #"var myList = /* :: */[ "a", /* :: */[ "b", /* :: */[ "c", /* [] */0 ] ]];">

var myList = /* :: */[  "a",  /* :: */[    "b",    /* :: */[      "c",      /* [] */0    ]  ]];

var myList = /* :: */[  "a",  /* :: */[    "b",    /* :: */[      "c",      /* [] */null    ]  ]];

Setup

npm install jsvu -g# Make sure to tick chakra, javascriptcore, spidermonkey, v8 and v8-debugjsvu

Run full Benchmark

# Will run the performance test for each JS engine./benchmark.sh

./benchmark.shRun V8:optimized: 1242 ms.original: 1722 ms.optimized: 1263 ms.original: 1734 ms.optimized: 1233 ms.original: 1760 ms.Run JavaSciptCore:optimized: 430 ms.original: 835 ms.optimized: 881 ms.original: 936 ms.optimized: 859 ms.original: 938 ms.Run SpiderMonkey:optimized: 542 ms.original: 492 ms.optimized: 567 ms.original: 482 ms.optimized: 546 ms.original: 518 ms.Run Chakra:optimized: 1112 ms.original: 3575 ms.optimized: 908 ms.original: 3479 ms.optimized: 894 ms.original: 3513 ms.

Credits