When dealing with a specific set of "Strings" that represent integers in an addition operation, how can one determine if the calculation is feasible in javascript? For example:
2 + 2 (certainly possible)
20000000000000000 - 1 (impossible)
2e50 + 2e60 (impossible)
200000 + 5 + 40 + 300 + 2000 + 10000The same principle applies to multiplication, whether it's achievable or not?
2*2 (possible)
3*2e200 (possible)
4*-3e700 (not possible)
Check out this link to learn more about JavaScript's MAX_SAFE_INTEGER and then try it in your browser's error console.
"use strict";
var i,
numbers=[
2+2,
20000000000000000 - 1,
2e50 + 2e60,
200000 + 5 + 40 + 300 + 2000 + 10000,
2*2,
3*2e200,
4*-3e700
],
s=numbers.length;
for(i=0;i<s;i++){
console.log(
'The value of array index '+i+' is'+
((Number.isSafeInteger((numbers[i])))?'':' NOT')+
' Safe'
);
}
Console output:
The value of array index 0 is Safe
The value of array index 1 is NOT Safe
The value of array index 2 is NOT Safe
The value of array index 3 is Safe
The value of array index 4 is Safe
The value of array index 5 is NOT Safe
The value of array index 6 is NOT Safe
While some numbers may be accurate, they cannot all be compared accurately due to their size.
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