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galanggg/function-composition.ts

Created June 7, 2024 05:50
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  1. galanggg created this gist Jun 7, 2024.
    27 changes: 27 additions & 0 deletions function-composition.ts
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    Original file line number Diff line number Diff line change
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    //define type for increment function

    type Increment = (x: number) => number
    const increment: Increment = x => x + 1

    //define type for toString function

    type Tostring = (x: number) => string
    const toString: Tostring = x => `"${x}"`

    //define type for increment then to string function
    type IncrementThenToString = (x: number) => string
    const increment_then_tostring: IncrementThenToString = x => toString(increment(x))

    console.log(increment_then_tostring(6))

    //make Compose Function

    type Compose = <A,B,C> {
    f: (x: B) => C,
    g: (x: A) => B
    => (x: A) => C
    }
    const compose: Compose = (f,g) => x => f(g(x))
    const increment_then_tostring2: IncrementThenToString = compose(tostring, increment)

    console.log(increment_then_tostring2(6))