NaN

NaN — Not a Number. A value that is used to represent the the value is not a number. This will often be a result when performing math operations on values that is not a number. This is the same as the value of Number.NaN.

Description

NaN

Examples

Example #1 – NaN

Run
var b = NaN;
console.log(typeof b);   // number
console.log(b);          // NaN

Example #2 – NaN as a math result

Run
var a = 'one';
var b = 2;
console.log(a * b);      // NaN
console.log(a);          // one
console.log(b);          // 2

See also

• Number.NaN

• Number.isNaN()

External references

• Mozilla: NaN