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koans 커밋 1차 #3

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50 changes: 25 additions & 25 deletions modern-js-koans/04_AboutFunctionMethods.js
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Original file line number Diff line number Diff line change
Expand Up @@ -13,9 +13,9 @@ describe('함수 메소드에 관해서', () => {
expect(foo).to.have.property('apply')
expect(foo).to.have.property('bind')

expect(foo()).to.eql(FILL_ME_IN)
expect(foo.call()).to.eql(FILL_ME_IN)
expect(foo.apply()).to.eql(FILL_ME_IN)
expect(foo()).to.eql('bar')
expect(foo.call()).to.eql('bar')
expect(foo.apply()).to.eql('bar')
expect(foo.bind()).to.exist
})

Expand All @@ -32,9 +32,9 @@ describe('call에 관해서', () => {
const context1 = { msg: 'welcome everyone' }
const context2 = { msg: 'good bye' }

expect(foo.call(context1)).to.eql(FILL_ME_IN)
expect(foo.call(context2).msg).to.eql(FILL_ME_IN)
expect(foo.call()).to.eql(FILL_ME_IN)
expect(foo.call(context1)).to.eql({ msg: 'welcome everyone' })
expect(foo.call(context2).msg).to.eql('good bye')
expect(foo.call()).to.eql(global)
})

it('call의 두번째 인자 이후로는 파라미터로 전달됩니다', () => {
Expand All @@ -45,9 +45,9 @@ describe('call에 관해서', () => {
const developer = { type: '개발자', feature: '언어' }
const artist = { type: '아티스트', feature: '노래' }

expect(printProfile.call(developer, '김코딩', 30)).to.eql(FILL_ME_IN)
expect(printProfile.call(developer, '박해커', 20, 'JavaScript')).to.eql(FILL_ME_IN)
expect(printProfile.call(artist, 'BTS', 7, 'ON', 'Dynamite')).to.eql(FILL_ME_IN)
expect(printProfile.call(developer, '김코딩', 30)).to.eql('개발자 김코딩 나이:30')
expect(printProfile.call(developer, '박해커', 20, 'JavaScript')).to.eql('개발자 박해커 나이:20 언어:JavaScript')
expect(printProfile.call(artist, 'BTS', 7, 'ON', 'Dynamite')).to.eql('아티스트 BTS 나이:7 노래:ON,Dynamite')
})

})
Expand All @@ -60,8 +60,8 @@ describe('apply에 관해서', () => {

const context = { msg: 'welcome you!' }

expect(foo.apply(context)).to.eql(FILL_ME_IN)
expect(foo.apply()).to.eql(FILL_ME_IN)
expect(foo.apply(context)).to.eql({ msg: 'welcome you!' })
expect(foo.apply()).to.eql(global)
})

it('apply의 두번째 인자는 배열입니다', () => {
Expand All @@ -72,9 +72,9 @@ describe('apply에 관해서', () => {
const developer = { type: '개발자', feature: '언어' }
const artist = { type: '아티스트', feature: '노래' }

expect(printProfile.apply(developer, FILL_ME_IN)).to.eql('개발자 김코딩 나이:30')
expect(printProfile.apply(developer, FILL_ME_IN)).to.eql('개발자 박해커 나이:20 언어:JavaScript')
expect(printProfile.apply(artist, FILL_ME_IN)).to.eql('아티스트 BTS 나이:7 노래:ON,Dynamite')
expect(printProfile.apply(developer, ['김코딩', 30])).to.eql('개발자 김코딩 나이:30')
expect(printProfile.apply(developer, ['박해커', 20, 'JavaScript'])).to.eql('개발자 박해커 나이:20 언어:JavaScript')
expect(printProfile.apply(artist, ['BTS', 7, 'ON', 'Dynamite'])).to.eql('아티스트 BTS 나이:7 노래:ON,Dynamite')
})

});
Expand All @@ -89,15 +89,15 @@ describe('bind에 관해서', () => {
const context = 'almost finish'

const boundFoo = foo.bind(context)
expect(typeof boundFoo).to.eql(FILL_ME_IN)
expect(boundFoo()).to.eql(FILL_ME_IN)
expect(typeof boundFoo).to.eql('function')
expect(boundFoo()).to.eql('almost finish')
})

it('bind의 인자 순서는 call과 동일합니다', () => {
const context = 'bind'

const boundFoo = foo.bind(context, ' is', ' useful')
expect(boundFoo()).to.eql(FILL_ME_IN)
expect(boundFoo()).to.eql('bind is useful')
})
})

Expand All @@ -108,15 +108,15 @@ xdescribe('call, apply의 유용한 예제를 확인합니다', () => {
const arrayNumbers = [5, 10, 4, 9]

it('spread operator, rest parameter가 탄생하기 이전엔 apply가 많이 쓰였습니다', () => {
expect(array1.concat(array2)).to.eql(FILL_ME_IN)
expect([...array1, ...array2]).to.eql(FILL_ME_IN)
expect(Math.max(...arrayNumbers)).to.eql(FILL_ME_IN)
expect(Math.max.apply(null, arrayNumbers)).to.eql(FILL_ME_IN)
expect(array1.concat(array2)).to.eql([ 'code', 'states', 'immersive', 'course' ])
expect([...array1, ...array2]).to.eql([ 'code', 'states', 'immersive', 'course' ])
expect(Math.max(...arrayNumbers)).to.eql(10)
expect(Math.max.apply(null, arrayNumbers)).to.eql(10)
})

it('prototype의 기능을 빌려 쓸 수 있습니다', () => {
expect(Array.prototype.concat.call(array1, array2, arrayNumbers)).to.eql(FILL_ME_IN)
expect(Array.prototype.concat.apply(array1, [array2])).to.eql(FILL_ME_IN)
expect(Array.prototype.concat.call(array1, array2, arrayNumbers)).to.eql([ 'code', 'states', 'immersive', 'course', 5, 10, 4, 9 ])
expect(Array.prototype.concat.apply(array1, [array2])).to.eql([ 'code', 'states', 'immersive', 'course' ])
})

it('유사 배열을 다루기에 용이합니다', () => {
Expand All @@ -127,8 +127,8 @@ xdescribe('call, apply의 유용한 예제를 확인합니다', () => {
2: 'span#new'
};

expect(Array.prototype.slice.apply(nodeList, [0, 1])).to.eql(FILL_ME_IN)
expect(Array.prototype.map.call(nodeList, node => node.split('#')[0])).to.eql(FILL_ME_IN)
expect(Array.prototype.slice.apply(nodeList, [0, 1])).to.eql([ 'div#target' ])
expect(Array.prototype.map.call(nodeList, node => node.split('#')[0])).to.eql([ 'div', 'li', 'span' ])
})
})

Expand Down
2 changes: 1 addition & 1 deletion package.json
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Original file line number Diff line number Diff line change
Expand Up @@ -19,4 +19,4 @@
"mocha": "^8.2.0",
"sinon": "^9.0.3"
}
}
}