modulo
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⟩ ⟩ ⟩ mod
mod(a, b) returns the nonnegative remainder of a / b.
remainder vs. modulo vs. mod
replit：
// ⭐️ mod: r = a - b*q // ------------------------ // • 0 <= r < |b| (remainder in math) function mod(a, b) { b = Math.abs(b); return ((a % b) + b) % b; }
💈範例：
// remainder (a % b) //┌─── `a` decides the "sign" ⭐️ //│ 5 % 3, // 2 5 % -3, // 2 -5 % 3, // -2 -5 % -3, // -2 // modulo(a, b) // ┌─── `b` decides the "sign" ⭐️ // │ modulo( 5, 3), // 2 modulo( 5, -3), // -1 modulo(-5, 3), // 1 modulo(-5, -3), // -2 modulo(6.4, 2.3), // 1.8000000000000007 // ⭐️ mod(a, b) (in math) // ┌─── always >= 0 ⭐️ // │ mod( 5, 3), // 2 mod( 5, -3), // 2 mod(-5, 3), // 1 mod(-5, -3), // 1
JavaScript: The Definitive Guide ⟩ 4.8
remainder (%) and are different remainder vs. modulo vs. mod
remainder (%)