CFP - Docs - subtract

subtract

(right: number) => (left: number) => number

Subtract one number from another

Try It

const subtract1From = subtract(1)
subtract1From(3) // is 2
const subtract1From = subtract(1)
subtract1From(3) // is 2

Try It

const subtract1From = subtract(1)
subtract1From(3) // is 2
const subtract1From = subtract(1)
subtract1From(3) // is 2

Sometimes we want to subtract a constant. Below, we're building a sword for our game, which attacks for five health. Let's test it on a zombie.

Try It

const sword = {
  attack: update({ health: subtract(5) }),
}

const enemy = {
  type: 'zombie',
  health: 15,
}

const woundedEnemy = sword.attack(enemy)
console.log(woundedEnemy)
// is {
//   type: zombie
//   health: 10
// }
type Enemy = {
  type: string
  health: number
}
const enemy: Enemy = {
  type: 'zombie',
  health: 15,
}

const sword = {
  attack: update({ health: subtract(5) })<Enemy>,
}

const woundedEnemy = sword.attack(enemy)
console.log(woundedEnemy)
// is {
//   type: zombie
//   health: 10
// }

Try It

const sword = {
  attack: update({ health: subtract(5) }),
}

const enemy = {
  type: 'zombie',
  health: 15,
}

const woundedEnemy = sword.attack(enemy)
console.log(woundedEnemy)
// is {
//   type: zombie
//   health: 10
// }
type Enemy = {
  type: string
  health: number
}
const enemy: Enemy = {
  type: 'zombie',
  health: 15,
}

const sword = {
  attack: update({ health: subtract(5) })<Enemy>,
}

const woundedEnemy = sword.attack(enemy)
console.log(woundedEnemy)
// is {
//   type: zombie
//   health: 10
// }