I have printed arr values in console they are like

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

but when this function gives an error i am not getting any values in arr

Uncaught Type Error: arr.filter is not a function

I am new to java-script and i don't have any idea what's this error is

function filter(arr, criteria) {
   return arr.filter(function (obj) {
        return Object.keys(criteria).every(function (c) {
            return obj[c] == criteria[c];
        });
    });
}

I have printed arr values in console they are like

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

but when this function gives an error i am not getting any values in arr

Uncaught Type Error: arr.filter is not a function

I am new to java-script and i don't have any idea what's this error is

function filter(arr, criteria) {
   return arr.filter(function (obj) {
        return Object.keys(criteria).every(function (c) {
            return obj[c] == criteria[c];
        });
    });
}

• javascript
• jquery

• is **arr** actually in your code or did you just try to highlight it? – NullDev Commented Nov 20, 2019 at 8:00
• @NullDev yes i highlight it – Ankit Yadav Commented Nov 20, 2019 at 8:35
• The error states that the .filter() function doesn't apply to the type that is stored in arr. var x = [];x.filter(function() {}) confirms that .filter works on an array. Therefore your arr variable is not an array. – fdomn-m Commented Nov 20, 2019 at 8:40
• Regardless of what you get in console, how do you generate arr that you pass into your filter function? – fdomn-m Commented Nov 20, 2019 at 8:40

1 Answer 1

Seems like the arr you are sending to the filter function is not an array, which is why the error is saying that arr.filter is not a function.

Just tried this and it works, so your function seems ok:

function filter(arr, criteria) {
   return arr.filter(function (obj) {
        return Object.keys(criteria).every(function (c) {
            return obj[c] == criteria[c];
        });
    });
}

const arr = [
  {
    name: "David",
    age: 54
  },
  {
    name: "Andrew",
    age: 32
  },
  {
    name: "Mike",
    age: 54 
  }
];
const myFilter = {"age": 54};
const result = filter(arr, myFilter);

console.log(result);