prototype chain lookup, cached or not
JavaScript performance comparison
Test case created by Kyle Simpson
Info
Testing/profiling the code patterns from the Script Junkie article "(pre)Maturely Optimize Your JavaScript"
http://msdn.microsoft.com/en-us/scriptjunkie/gg622887.aspx
Snippet comparison #5
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Testing in unknown unknown
| Test |
Ops/sec |
full chain lookup |
var foo = {
fun: "weee!"
},
bar = Object.create(foo),
baz = Object.create(bar),
_fun = baz.fun,
res = "";
for (var i = 0; i < 1000; i++) {
res += baz.fun[i % baz.fun.length]; // not using the cached scope lookup
}
|
pending… |
cached chain lookup |
var foo = {
fun: "weee!"
},
bar = Object.create(foo),
baz = Object.create(bar),
_fun = baz.fun,
res = "";
for (var i = 0; i < 1000; i++) {
res += _fun[i % _fun.length]; // not using the cached scope lookup
}
|
pending… |
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