It’s because + is two different operators and overloads based on the type to the left, while - is only a numeric operator and coerces left and right operands to numeric. But frankly if you’re still using + for math or string concatenation in 2025, you’re doing it wrong.
It’s much better to make your own function that uses bitwise operations to do addition.
functionadd(a, b) {
while (b !== 0) {
// Calculate carrylet carry = a & b;
// Sum without carry
a = a ^ b;
// Shift carry to the left
b = carry << 1;
}
return a;
}
It’s because
+is two different operators and overloads based on the type to the left, while-is only a numeric operator and coerces left and right operands to numeric. But frankly if you’re still using+for math or string concatenation in 2025, you’re doing it wrong.I know nothing about javascript, what is wrong with using + for math? perhaps naively, I’d say it looks suited for the job
The native arithmetic operators are prone to floating point rounding errors
The correct way to do it is to load a 500mb library that has an add function in it.
Point taken but the one I use is only ~200k for the whole package, ~11k for the actual file that gets loaded
It’s much better to make your own function that uses bitwise operations to do addition.
function add(a, b) { while (b !== 0) { // Calculate carry let carry = a & b; // Sum without carry a = a ^ b; // Shift carry to the left b = carry << 1; } return a; }(For certain definitions of better.)