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Clarify that it can not be used to check if a String looks like a number
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adius
adius
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Since To check if a variable contains a valid number and not just a String which looks like a number, Number.isFinite(value) can be used.

This is part of the language since ES2015 the correct answer to this is:

Number.isFinite(value)

Examples:

Number.isFinite(Infinity)   // false
Number.isFinite(NaN)        // false
Number.isFinite(-Infinity)  // false

Number.isFinite(0)          // true
Number.isFinite(2e64)       // true

Number.isFinite('0')        // false
Number.isFinite(null)       // false

Since ES2015 the correct answer to this is:

Number.isFinite(value)

Examples:

Number.isFinite(Infinity)   // false
Number.isFinite(NaN)        // false
Number.isFinite(-Infinity)  // false

Number.isFinite(0)          // true
Number.isFinite(2e64)       // true

Number.isFinite('0')        // false
Number.isFinite(null)       // false

To check if a variable contains a valid number and not just a String which looks like a number, Number.isFinite(value) can be used.

This is part of the language since ES2015

Examples:

Number.isFinite(Infinity)   // false
Number.isFinite(NaN)        // false
Number.isFinite(-Infinity)  // false

Number.isFinite(0)          // true
Number.isFinite(2e64)       // true

Number.isFinite('0')        // false
Number.isFinite(null)       // false
added 71 characters in body
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Michael Haren
Michael Haren
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Since ES2015ES2015 the correct answer to this is:

Number.isFinite(value)

Examples:

Number.isFinite(Infinity)   // false
Number.isFinite(NaN)        // false
Number.isFinite(-Infinity)  // false

Number.isFinite(0)          // true
Number.isFinite(2e64)       // true

Number.isFinite('0')        // false
Number.isFinite(null)       // false

Since ES2015 the correct answer to this is:

Number.isFinite(value)

Examples:

Number.isFinite(Infinity)   // false
Number.isFinite(NaN)        // false
Number.isFinite(-Infinity)  // false

Number.isFinite(0)          // true
Number.isFinite(2e64)       // true

Number.isFinite('0')        // false
Number.isFinite(null)       // false

Since ES2015 the correct answer to this is:

Number.isFinite(value)

Examples:

Number.isFinite(Infinity)   // false
Number.isFinite(NaN)        // false
Number.isFinite(-Infinity)  // false

Number.isFinite(0)          // true
Number.isFinite(2e64)       // true

Number.isFinite('0')        // false
Number.isFinite(null)       // false
Source Link
adius
adius
  • 15.2k
  • 7
  • 48
  • 51

Since ES2015 the correct answer to this is:

Number.isFinite(value)

Examples:

Number.isFinite(Infinity)   // false
Number.isFinite(NaN)        // false
Number.isFinite(-Infinity)  // false

Number.isFinite(0)          // true
Number.isFinite(2e64)       // true

Number.isFinite('0')        // false
Number.isFinite(null)       // false
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