3 snippets across 2 stacks - JavaScript, Python
implicit: value + "" | +value | !!value
explicit: String(v) | Number(v) | Boolean(v)console.log("5" + 3); // "53" (string concat)
console.log("5" - 3); // 2 (numeric)
console.log(+"42"); // 42 (to number)
console.log(!!"hello"); // true (to boolean)
console.log(Number("")); // 0
console.log(Number("ab")); // NaNNote The + operator with a string always coerces to string. Prefer explicit conversion (Number(), String()) to avoid surprises.
Number(value)
parseInt(string, radix)
parseFloat(string)console.log(Number("42")); // 42
console.log(Number("3.14abc")); // NaN
console.log(parseInt("3.14abc")); // 3
console.log(parseFloat("3.14abc")); // 3.14
console.log(parseInt("ff", 16)); // 255Note Number() is stricter -- rejects partially numeric strings. parseInt() stops at the first non-numeric character. Always pass the radix to parseInt() to avoid octal surprises.
int(x)
float(x)
complex(real, imag)print(int("42"))
print(int(9.99))
print(float("3.14"))
print(int("0xff", 16))42
9
3.14
255Note int() truncates toward zero (not floor). int('3.14') raises ValueError; convert to float first, then to int.