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process: simplify check in previousValueIsValid() #24836

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process: simplify check in previousValueIsValid() #24836

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process: simplify check in previousValueIsValid() 
This commit replaces a call to Number.isFinite() with a
cheaper typeof check. The subsequent range checks ensure that
the checked value is finite.
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@cjihrig
cjihrig committed Dec 4, 2018
commit 9dd8c2dce60151ccf1ce6b1bbc4b4cd8ed73d1a3
2 changes: 1 addition & 1 deletion lib/internal/process/per_thread.js
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Original file line number Diff line number Diff line change
Expand Up @@ -85,7 +85,7 @@ function setupCpuUsage(_cpuUsage) {
// Ensure that a previously passed in value is valid. Currently, the native
// implementation always returns numbers <= Number.MAX_SAFE_INTEGER.
function previousValueIsValid(num) {
return Number.isFinite(num) &&
return typeof num === 'number' &&
num <= Number.MAX_SAFE_INTEGER &&
num >= 0;
}
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