JavaScript Numbers

Number in javascript is any number either it is integer or floating number, is always a double precision 64 bit number or double precision floating point numbers as IEEE 754 specification.

Number is a data type in javascript, which is used to store integer or floating numbers in a variable in a positive and negative range from 2 ^-1074 to 2 ¹⁰²³ × (2 – 2^-52) as IEEE 754 specification. Numbers stored beyond this range does not produce accurate results.

Example

<script>
let a = 20;
let b = 40;
let c  = a + b;
document.write(c);
</script>

Get smallest positive numeric value

<script>
document.write(Number.MIN_VALUE);
</script> 

Number.MIN_VALUE is a static data property, returns smallest non-zero positive numeric value in javascript.

Get maximum positive numeric value

<script>
document.write(Number.MAX_VALUE);
</script>

Number.MAX_VALUE is a static data property in javascript, returns maximum non-zero positive numeric value.

Number min and max value range

Check given number is a safe integer

javascript provides a static method isSafeInteger() to check, a given integer number is in safe range or not.

<script>
let num = 40;
if (Number.isSafeInteger(num)) {
   document.write(num);

  }
</script> 

NaN

Its full-form is Not A Number. javascript returns NaN, when a value or data is not number.

Check weather the value is number or not

javascript provides a method called isNaN(), which checks given number is a valid number or not.

<script>

let num = 40;
if(isNaN(num))
  document.write(num);

</script>

Infinity

It is used to represent positive infinity. It is the highest numeric value available in javascript. crosses upper limit.

-Infinity

It represents negative infinity and the smallest numeric value available. crosses lower limit