[removed] Whats the best way Convert Array into Ob

问题:

This question already has answers here:

Convert Array to Object (44 answers)

Closed 2 years ago.

what is the best way to convert:

a = ['USD', 'EUR', 'INR']

to

a = {'USD': 0, 'EUR': 0, 'INR': 0};

*manipulating array element as key of objects with value as initially 0.

回答1:

Use Array#reduce method to reduce into a single object.

a = ['USD', 'EUR', 'INR'];

console.log(
  a.reduce(function(obj, v) {
    obj[v] = 0;
    return obj;
  }, {})
)

---

Or even simple for loop is fine.

var a = ['USD', 'EUR', 'INR'];
var res = {};

for (var i = 0; i < a.length; i++)
  res[a[i]] = 0;

console.log(res);

回答2:

You could use Object.assign with Array#map and spread syntax ...

var array = ['USD', 'EUR', 'INR'],
    object = Object.assign(...array.map(k => ({ [k]: 0 })));

console.log(object);

回答3:

You can use a Array.map and Object.assign

var a = ['USD', 'EUR', 'INR']
var result = Object.assign.apply(null, a.map(x =>({[x]:0})));
console.log(result)

回答4:

Use the Map constructor:

new Map(a.map(x => [x, 0]))