Validate decimal numbers in JavaScript - IsNumeric()

Question

What's the cleanest, most effective way to validate decimal numbers in JavaScript?

Bonus points for:

1. Clarity. Solution should be clean and simple.

2. Cross-platform.

Test cases:

01. IsNumeric('-1') => true 

02. IsNumeric('-1.5') => true 

03. IsNumeric('0') => true 

04. IsNumeric('0.42') => true 

05. IsNumeric('.42') => true 

06. IsNumeric('99,999') => false 

07. IsNumeric('0x89f') => false 

08. IsNumeric('#abcdef') => false 

09. IsNumeric('1.2.3') => false 

10. IsNumeric('') => false 

11. IsNumeric('blah') => false

Answer 1

The cleanest and most effective way to validate decimal numbers in JavaScript is to following the below-mentioned way:-

isNumber: function(o) { 

return typeof o === 'number' && isFinite(o); 

}

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