M (Math)

Non-dual

inc(n: number): number
dec(n: number): number
negate(n: number): number
product(arr: number[]): number

Dual

add(a: number, b: number): number
subtract(a: number, b: number): number
multiply(a: number, b: number): number
divide(a: number, b: number): number
modulo(a: number, b: number): number

Examples

import { pipe, A, M } from '@stopcock/fp'

// apply discount
pipe(prices, A.map(M.multiply(0.9)))  // 10% off

// offset scores
pipe(rawScores, A.map(M.add(curve)))

// compound product
M.product([2, 3, 4])  // 24

// counter operations
pipe(count, M.inc)     // count + 1
pipe(count, M.dec)     // count - 1
pipe(value, M.negate)  // -value

// data-first
M.modulo(17, 5)  // 2