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Number Static Methods

Number.isNaN()

Determine whether the passed value is NaN.

Number.isFinite()

Determine whether the passed value is a finite number.

Number.isInteger()

Determine whether the passed value is an integer.

Number.isSafeInteger()

Determine whether the passed value is a safe integer (a number between -(253 - 1) and 253 - 1).

Number.parseFloat()

Convert a string or a number to a float.

Number.parseInt()

Convert a string or a number to an integer.

Note that isNan(), isFinite(), parseFloat(), and parseInt() also exist as global functions.
RESETRUNFULL
<!DOCTYPE html><html><body><script>

<!DOCTYPE html><html><body><script>
   console.log(isNaN(NaN));              // true
   console.log(Number.isNaN(NaN));  // true
      console.log(isFinite(100));              // true
   console.log(Number.isFinite(100));  // true      // console.log(isInteger(100.0));  // ReferenceError
   console.log(Number.isInteger(100.0));  // true      // console.log(isSafeInteger(100.0));  // ReferenceError
   console.log(Number.isSafeInteger(100.0));  // true
      console.log(parseFloat(10));              // 10
   console.log(Number.parseFloat(10));  // 10
      console.log(parseInt("100abc123"));    // 100
   console.log(Number.parseInt(100.9));  // 100
      console.log(parseInt('10a',2)); // base 2 --> 10 --> 2
   console.log(parseInt('10A',15)); // base 15 --> 235</script></body></html>

</script></body><html>

<!DOCTYPE html><html><body><script>

function isNumeric(n) {
  return !isNaN(parseFloat(n)) && isFinite(n);}

</script></body><html>

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<!DOCTYPE html><html><body><script>

Here, 1/0 -> “Inifinity" -> 18nifity -> 18

</script></body><html>

<!DOCTYPE html><html><body><script>

<!DOCTYPE html><html><body><script>
   console.log(parseInt(1/0, 19)); // 18</script></body></html>

</script></body><html>