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질문&답변
2021.01.25
return()
map 돌릴 때 undefined is not an object 뜨시는 것은 아래처럼 물음표 넣어주시면 될 거 같아요. { item . phoneNumbers [ 0 ]?. number }
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질문&답변
2021.01.25
return()
이렇게 말씀이신가요? {}로 감싸져 있기에 return이 2개 나 n개 인거는 문제가 아닌 거 같아요. render (){ return ( View style = { styles . container } > Text onPress = {this . changeState } style = { styles . text } > { this . state . sampleText } Text > { this . inputText () } Text onPress = {this . onAdd } style = { styles . text } > { this . state . sampleNum } Text > Text onPress = {this . changeState } style = { styles . text } > { this . state . sampleText } Text > { this . inputText () } Text onPress = {this . onAdd } style = { styles . text } > { this . state . sampleNum } Text > PropsChild sampleText = {this . state . sampleText } changeState = {this . changeState } /> Image source = { { uri : this . state . avatar } } style = { styles . avatar } > Image > Button title = "Add an Image" onPress = { () =>this . addImage () } /> Text onPress = {this . onAdd } style = { styles . text } > { this . state . avatar } Text > { this . state . myContacts . map (( item , idx ) => { return ( Text key = { idx } > { idx } { item . givenName } { item . phoneNumbers [ 0 ]?. number } Text > ) }) } Text > aaaa Text > Button title = "Load Contacts" onPress = { () =>this . getContacts () } /> View > ) }
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