[英]JavaScript6: adding element (key, value) to a ES6 map
在jsx中,我有一张类似的地图:
var myMap=Map([['rowNumber', '30'], ['id', '80'], ['firstName', '180'], ['lastName', '180'], ['mobile', '180'], ['username', '180'], ['password', '180']])
如何以编程方式向此地图添加新元素,例如:['ssn','12']?
您正在寻找set
方法 :
myMap.set('ssn', '12');
如果您有一个入口元组,则可以使用
const newEntry = ['ssn', '12'];
myMap.set(newEntry[0], newEntry[1]);
// or also
myMap.set(...newEntry) // however that might be confusing
看看地图参考: https : //developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Map
您可以使用以下myMap.set(keyString, "value associated with 'a string'");
向地图添加项目: myMap.set(keyString, "value associated with 'a string'");
您可以使用set()
方法和传播语法来添加两个元素组成的数组,作为键和值。
var myMap = new Map([['rowNumber', '30'], ['id', '80'], ['firstName', '180'], ['lastName', '180'], ['mobile', '180'], ['username', '180'], ['password', '180']]) myMap.set(...['ssn', '12']) for(var i of myMap) console.log(i)
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