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Next.jsの備忘録

Last updated at Posted at 2022-05-10

前書き

Object.values(hoge)


const numbers=[1,2,3]

console.log(Object.values(numbers))


///実行結果
[1,2,3]


Array.prototype.some()

オブジェクトの中身をいじるのに使うもの。everyと違って、何個かに適用されるのみ。

//書き方

const numbers=[1,2,3]

 const textCheck = () => {
    if (Object.values(numbers).some((number) => (return(number*2))))
  }

Array.prototype.every()

オブジェクトの中身をいじるのに使うもの。someと違って、全てに適用される。

//書き方

const numbers=[1,2,3]

 const textCheck = () => {
    if (Object.values(numbers).every((number) => (return(number*2))))
  }

if文、三項演算子、switch文

const hogehoge =(numbers)=>{

const numbers=[1,2,3]

return(
<div>

//三項演算子
 <p>
  {numbers.[1] === 1 ? first:'others'}
 </p>
 <p>
  {numbers.[0] === 1 ? first : numbers.[1] === 2 ? second : numbers.[2] === 3 : third}
 </p>

//if文とswitch文
 <p>
  {(()=>{
    if(numbers === 1){
     return('first')
    }else{
   return('others')}
  }}
  {(()=>{
    switch(numbers){
     case '1':
       return('first')
     case '2':
       return('second')
     case '3':
       return('third')
      }
   })()}
 </p>
</div>

)}

追記中...

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