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isNumeric()

isNumeric(val): val is number

Determine if given value is a number, or string that parses to a number. Includes infinities and NaN.

Non-finite strings are: 'Infinity', '-Infinity', and 'NaN'.

Parameters​

val​

unknown

Returns​

val is number

Example​

isNumeric(1.23) // true
isNumeric('Infinity') // true
isNumeric(NaN) // true
isNumeric('1.23') // true
isNumeric('hi') // false