.filter is not a function [duplicate]

问题

This question already has answers here:

Filter object properties by key in ES6 (24 answers)

Closed last year.

This is my object (made sure it's a typeof object):

{
    "1": {"user_id":1,"test":"","user_name":"potato0","isok":"true"},

    "2":{"user_id":2,"test":"","user_name":"potato1","isok":" true"},

    "3":{"user_id":3,"test":"","user_name":"potato2","isok":" true"},

    "4":{"user_id":4,"test":"","user_name":"potato3","isok":"locationd"}

}

Why using .filter doesn't work for me?

Is it because my variable is typeof object and the method works only with arrays?

this.activeUsers = window.users.filter( function(user) {
     // return ( (user.test === '0') && (user.isok === '0') ); 
     return user.user_id === 1;
}); 

getting the error:

.filter is not a function

What is the suggested alternative with objects?

回答1:

filter is a method on arrays. Since the code you posted contains an object, you're seeing this error. You may want to apply filter after getting all the values from the object using Object.values, like this:

var users = {
  "1": {
    "user_id": 1,
    "test": "",
    "user_name": "potato0",
    "isok": "true"
  },

  "2": {
    "user_id": 2,
    "test": "",
    "user_name": "potato1",
    "isok": " true"
  },

  "3": {
    "user_id": 3,
    "test": "",
    "user_name": "potato2",
    "isok": " true"
  },

  "4": {
    "user_id": 4,
    "test": "",
    "user_name": "potato3",
    "isok": "locationd"
  }
};

console.log(Object.values(users).filter(user => user.user_id === 1));

来源：https://stackoverflow.com/questions/55458675/filter-is-not-a-function