傳播運營商取代價值？

Question

爲什麼傳播運算符在這裏用'HB woodlawn'代替'Stratford'的值？這個怎麼用？

const editName = (oldName, name, arr) => 
    arr.map(item => { 
    if (item.name === oldName) { 
     return { 
     ...item, 
     name 
     } 
    } else { 
     return item 
    } 
    }) 

let schools = [ 
    { name: "Yorktown"}, 
    { name: "Stratford" }, 
    { name: "Washington & Lee"}, 
    { name: "Wakefield"} 
] 
let updatedSchools = editName("Stratford", "HB Woodlawn", schools) 
console.log(updatedSchools[1]) // { name: "HB Woodlawn" } 
console.log(schools[1]) // { name: "Stratford" }, 

Answer 1

什麼它歸結爲是這樣的：

const oldObject = { name: 'Stratford' }; 
const newObject = { ...oldObject, name: 'HB Woodlawn' }; 

，你能想到的作爲擴大oldObject的屬性到新對象字面：

const newObject = { name: 'Stratford', name: 'HB Woodlawn' }; 

屬性具有相同鍵入一個字面值得到最後一個值。