Language
JavaScript
Compiler
Node.js 14.0.0
Options
$ node prog.js JavaScript parseInt() と Math.floor() のその速度比較
--------
parseInt( v ) の速度を計測
[
144.2425765991211,
148.3888168334961,
136.2340850830078,
150.02034759521484,
144.38919067382812
] ms.
--------
Math.floor( v ) の速度を計測
[
164.4596176147461,
165.74459838867188,
171.30847930908203,
166.59954833984375,
164.39278411865234
] ms.
--------
Math.trunc( v ) の速度を計測
[
183.10205078125,
157.0017852783203,
162.56234741210938,
179.65151977539062,
158.25049591064453
] ms.
--------
v | 0 の速度を計測
[
171.83443450927734,
154.78660583496094,
155.2477035522461,
171.82415008544922,
158.69107055664062
] ms.
--------
結論 -> parseInt は 0付近のみ異常に遅い
{
node: '14.0.0',
v8: '8.1.307.30-node.30',
uv: '1.37.0',
zlib: '1.2.11',
brotli: '1.0.7',
ares: '1.16.0',
modules: '83',
nghttp2: '1.40.0',
napi: '6',
llhttp: '2.0.4',
openssl: '1.1.1f',
cldr: '36.1',
icu: '66.1',
tz: '2019c',
unicode: '13.0'
}
Exit Code:
0