JavaScript Number Min & Max & Safe Values

Convert Decimal to Binary 64 Bit & Vice Versa

You can follow these links to find out how to

1. convert decimal number to binary 64-bit
2. convert binary 64-bit number to decimal

MAX_SAFE_INTEGER & MIN_SAFE_INTEGER

The Number.MAX_SAFE_INTEGER constant represents the maximum safe integer that you can use in JavaScript. It is the static property of the Number object. It has the value of 9007199254740991.

It is referred to as safe because any number more than the above number is not guaranteed to be represented exactly and correctly. This is not the limitation of the JavaScript, but a limitation imposed by the double-precision 64-bit number format followed by Javascript

                            
console.log(Number.MAX_SAFE_INTEGER)    //9007199254740991
console.log(Number.MIN_SAFE_INTEGER)    //-9007199254740991
 
 
*** output ****
9007199254740991
-9007199254740991
                            
                        
                            
                        

9007199254740991 is represented

isSafeInteger

You can use the Number.isSafeInteger method to check whether the number is safe.

                            
console.log(Number.isSafeInteger(Number.MAX_SAFE_INTEGER));
console.log(Number.isSafeInteger(Number.MAX_SAFE_INTEGER+1));
 
//*** output **
//true
//false
                        
                            
                        

MAX_VALUE & MIN_VALUE

The largest number possible to represent using the number data type is 1.7976931348623157e+308 and it is represented by Number.MAX_VALUE. The lowest number is Number.MIN_VALUE.

                            
console.log(Number.MAX_VALUE)
console.log(Number.MIN_VALUE)
 
****** Output *****
1.7976931348623157e+308
5e-324
        
                        
                            
                        

Numbers beyond Number.MAX_VALUE cannot be represented using the double-precision 64-bit binary system. Hence any value above the MAX_VALUE is truncated to the MAX_VALUE.

                            
 console.log(Number.MAX_VALUE + 100 == Number.MAX_VALUE);  
 
 //**output
 //true
        
                        
                            
                        

While the very large value results in infinity

                            
console.log(Number.MAX_VALUE + Number.MAX_VALUE);   
 
 **output
 //Infinity
        
                        
                            
                        

Numbers & Bitwise operators

The bitwise operators and shift operators operate on 32-bit integers only, so in that case, the max safe integer is 2147483647.

Summary

The JavaScript Number object has static properties MAX_SAFE_INTEGER, MIN_SAFE_INTEGER, MAX_VALUE & MIN_VALUE. These represent the Maximum/Minimum values that are supported by the number data type. The MAX_SAFE_INTEGER & MIN_SAFE_INTEGER are extremely important, as any number above these numbers are not guaranteed to be represented exactly and correctly.

Read More

1. JavaScript Tutorial
2. Data Types in JavaScript
3. JavaScript String
4. Template Strings & String Interpolation
5. Tagged Templates
6. String to Number
7. String
8. Infinity
9. BigInt
10. BintInt Vs Number
11. Boolean Data Type
12. Undefined
13. null
14. null vs undefined