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40 lines
857 B
Markdown
40 lines
857 B
Markdown
---
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date: 2020-09-23
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id: adb898a3-6623-4bd5-92e6-408287d8cb31
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title: JavaScript Number library
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---
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# ES6
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## .EPSILON
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Compares floating point numbers with a tolerance for rounding errors.
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## .isInteger(num)
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``` javascript
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console.log(Number.isInteger(1.05)) // false
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console.log(Number.isInteger(1)) // true
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console.log(Number.isInteger(-3.1)) // false
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console.log(Number.isInteger(-3)) // true
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```
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## .isNaN
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Checks whether num is the value NaN. In contrast to the global function
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isNaN(), it doesn’t coerce its argument to a number and is therefore
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safer for non-numbers:
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``` javascript
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console.log(isNaN('???')) // true
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console.log(Number.isNaN('???')) // false
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```
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## .isFinite
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Determines whether the passed value is a finite number
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``` javascript
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console.log(Number.isFinite(Infinity)) // false
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console.log(Number.isFinite(123)) // true
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```
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