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Add orJustCall, with tests #14

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Add orJustCall, with tests #14

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3f84d1e
Add orJustCall, with tests
benadamstyles Feb 8, 2018
47ed946
removed failing (and unnecessary) expectation
benadamstyles Feb 8, 2018
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8 changes: 8 additions & 0 deletions src/maybe.js
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Original file line number Diff line number Diff line change
Expand Up @@ -55,6 +55,10 @@ class Just<A> {
return this.value
}

orJustCall(): A {
return this.value
}

}

class Nothing {
Expand Down Expand Up @@ -93,6 +97,10 @@ class Nothing {
return value
}

orJustCall<B>(f: () => B): B {
return f()
}

}

function isNil<T>(value: ?T): boolean {
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2 changes: 2 additions & 0 deletions src/maybe.js.flow
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,7 @@ declare class Just<A> {
map<B: AnyVal>(f: (_: A) => B): Maybe<B>;
orElse<B>(m: Maybe<B>): Maybe<A>;
orJust<B>(value: B): A;
orJustCall<B>(f: () => B): A;
}

declare class Nothing {
Expand All @@ -26,6 +27,7 @@ declare class Nothing {
map<A, B: AnyVal>(f: (_: A) => B): Nothing;
orElse<B>(m: Maybe<B>): Maybe<B>;
orJust<B>(value: B): B;
orJustCall<B>(f: () => B): B;
}

declare export function just<T>(value: AnyVal): Just<T>;
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11 changes: 11 additions & 0 deletions src/maybe.test.js
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Expand Up @@ -44,6 +44,17 @@ test('orJust', () => {
expect(y.orJust()).toBe('hello')
})

test('orJustCall', () => {
const x = maybe(null)
const orValue = x.orJustCall(() => 'hi')
expect(orValue).toBe('hi')
const y = maybe('hello')
expect(y.orJustCall(() => 'bye')).toBe('hello')
const fn = jest.fn(() => 'bye')
expect(y.orJustCall(fn)).toBe('hello')
expect(fn).not.toHaveBeenCalled()
})

test('map value', () => {
const x = maybe('bob')
const result = x.map(v => v.toUpperCase())
Expand Down