Postman capturing elements where another element criteria is matched

Question

My response code is as follows:

[
    {
        "id": 364,
        "siteName": "FX21 - PortA",
    },
    {
        "id": 364,
        "siteName": "FX21 - PortB",
    },
    {
        "id": 370,
        "siteName": "FX05 - ER",
    },

In postman I am wanting to populate an array variable with all siteName values only where id = 364. So my expected array is to look like [FX21 - PortA, FX21 - PortB]

I've tried the following but this only returns the first siteName value:

var requiredId = pm.response.json().find(function(element){
    if (element.id == "364"){

        return element;
    }
});

[`find`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/find) returns the first match. You wanted to use [`filter`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter) instead. — 31piy, Apr 18 '19 at 06:50
Also instead of `if (element.id == "364"){` you should do `if (element.id ===364){` — brk, Apr 18 '19 at 06:52

Fullstack Guy · Answer 1 · 2019-04-18T07:20:38.550

Use a combination of Array.filter to filter id having value 364.
And Array.map to map it to an array of only siteName values.
Along with destructuring assignment to extract the keys of the object:

const response = [
    {
        "id": 364,
        "siteName": "FX21 - PortA",
    },
    {
        "id": 364,
        "siteName": "FX21 - PortB",
    },
    {
        "id": 370,
        "siteName": "FX05 - ER",
    }
]
function getSiteNameById(idFilter){
 return response.filter(({id}) => id === idFilter).map(({siteName}) => siteName);
}
console.log(getSiteNameById(364));

Or Array.reduce to do it in one shot where you can check for the id and then accumulate the element in the final array:

const response = [
        {
            "id": 364,
            "siteName": "FX21 - PortA",
        },
        {
            "id": 364,
            "siteName": "FX21 - PortB",
        },
        {
            "id": 370,
            "siteName": "FX05 - ER",
        }
    ]
function getSiteNameById(idFilter){
 return response.reduce((acc, ele) => {
    return  ele.id === idFilter ? acc.concat(ele.siteName) : acc;
 }, []);
}
console.log(getSiteNameById(364));

`reduce` is a better choice where you have to filter and map both. — 31piy, Apr 18 '19 at 06:55
@31piy Yes I agree that is a better and concise approach! Thank you! — Fullstack Guy, Apr 18 '19 at 07:00

Postman capturing elements where another element criteria is matched

1 Answers1