Created
January 11, 2020 02:23
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const buf = Buffer.allocUnsafe(16); | |
function f1(buf) { | |
return ( | |
buf.slice(0, 4).toString("hex") + | |
"-" + | |
buf.slice(4, 6).toString("hex") + | |
"-" + | |
buf.slice(6, 8).toString("hex") + | |
"-" + | |
buf.slice(8, 10).toString("hex") + | |
"-" + | |
buf.slice(10, 16).toString("hex") | |
); | |
} | |
function f2(buf) { | |
return [ | |
buf.slice(0, 4).toString("hex"), | |
buf.slice(4, 6).toString("hex"), | |
buf.slice(6, 8).toString("hex"), | |
buf.slice(8, 10).toString("hex"), | |
buf.slice(10, 16).toString("hex"), | |
].join("-"); | |
} | |
function f3(buf) { | |
const sl = buf.toString("hex"); | |
return [ | |
sl.slice(0, 8), | |
sl.slice(8, 12), | |
sl.slice(12, 16), | |
sl.slice(16, 20), | |
sl.slice(20, 32), | |
].join("-"); | |
} | |
function f4(buf) { | |
const sl = buf.toString("hex"); | |
return ( | |
sl.slice(0, 8) + | |
"-" + | |
sl.slice(8, 12) + | |
"-" + | |
sl.slice(12, 16) + | |
"-" + | |
sl.slice(16, 20) + | |
"-" + | |
sl.slice(20, 32) | |
); | |
} | |
function f5(buf) { | |
const sl = buf.toString("hex"); | |
return sl; | |
} | |
console.log(f1(buf)); | |
console.log(f2(buf)); | |
console.log(f3(buf)); | |
console.log(f4(buf)); | |
console.log(f5(buf)); | |
console.time("f1"); | |
for (i = 0; i < 1000000; i++) { | |
f1(buf); | |
} | |
console.timeEnd("f1"); | |
console.time("f2"); | |
for (i = 0; i < 1000000; i++) { | |
f2(buf); | |
} | |
console.timeEnd("f2"); | |
console.time("f3"); | |
for (i = 0; i < 1000000; i++) { | |
f3(buf); | |
} | |
console.timeEnd("f3"); | |
console.time("f4"); | |
for (i = 0; i < 1000000; i++) { | |
f4(buf); | |
} | |
console.timeEnd("f4"); | |
console.time("f5"); | |
for (i = 0; i < 1000000; i++) { | |
f5(buf); | |
} | |
console.timeEnd("f5"); |
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nodejs 10 output:
00000000-0000-0000-0000-000000000000
00000000-0000-0000-0000-000000000000
00000000-0000-0000-0000-000000000000
00000000-0000-0000-0000-000000000000
00000000000000000000000000000000
f1: 1060.335ms
f2: 1219.683ms
f3: 408.617ms
f4: 246.338ms
f5: 149.422ms