11 lines
314 B
Markdown
11 lines
314 B
Markdown
### Validate number
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Use `!isNaN` in combination with `parseFloat()` to check if the argument is a number.
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Use `isFinite()` to check if the number is finite.
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Use `Number()` to check if the coercion holds.
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```js
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const validateNumber = n => !isNaN(parseFloat(n)) && isFinite(n);
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// validateNumber('10') -> true
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```
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