is-number

Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.

v7.0.0 URL: https://unpkg.com/is-number@7.0.0/index.js

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cast check coerce coercion finite integer is isnan is-nan is-num is-number isnumber isfinite istype kind math nan num number numeric parseFloat parseInt test type typeof value

@stdlib/math-base-assert-is-nan

Test if a double-precision floating-point numeric value is NaN.

v0.2.2 URL: https://unpkg.com/@stdlib/math-base-assert-is-nan@0.2.2/lib/index.js

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stdlib stdmath assertion assert utilities utility utils util math mathematics ieee754 floating-point float number numeric non-numeric nan is isnan type check

@stdlib/assert-is-nan

Test if a value is NaN.

v0.2.2 URL: https://unpkg.com/@stdlib/assert-is-nan@0.2.2/lib/index.js

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stdlib stdassert assertion assert utilities utility utils util number numeric non-numeric nan is isnan type check validate valid test

lodash.isnan

The lodash method `_.isNaN` exported as a module.

v3.0.2 URL: https://unpkg.com/lodash.isnan@3.0.2/index.js

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lodash-modularized isnan

validate.io-nan

Validates if a value is NaN.

v1.0.3 URL: https://unpkg.com/validate.io-nan@1.0.3/lib/index.js

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validate.io validate validation validator number numeric non-numeric nan is isnan type check