Referencing an object in an array using the function attribute

Question

I have problem.
I would like to create search array function, but in array I have objects and I don't know how referencing to keys this objects from function attribute.

var array= [{
    name: 'Joe',
    surname: 'Smith'
}, {
    name: 'John',
    surname: 'Smith'
}];


function searchAndGetIndex(arrayName, key, value) {
    var cloneArray = [...arrayName];
    var saveIndex = [];

    for(var i = 0; i < arrayName.length; i++) {
        var getIndex = cloneArray.findIndex(x => x.key == value); // x.key is my problem
        if(getFilterResult !== -1) saveIndex.push(getIndex + i);
        cloneArray.splice(getIndex , 1);
    }

    return saveIndex;
}

console.log(searchAndGetIndex(array, name, 'John')); // 1

Thanks for help.

Niladri Basu · Accepted Answer · 2018-07-06 16:39:06Z

1

IMHO, this is what you want:

var array= [{
    name: 'Joe',
    surname: 'Smith'
}, {
    name: 'John',
    surname: 'Smith'
}];

function searchAndGetIndex(arrayName, key, value) {
    let cloneArray = [...arrayName];
    let saveIndex = [];
    
    cloneArray.forEach((e, i) => {
      if(e[key] === value) {
        saveIndex.push(i)
      }
    })
    return saveIndex;
}

console.log(searchAndGetIndex(array, 'name', 'John'));

answered Jul 6, 2018 at 16:39

Niladri Basu

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Comments

NullPointer · Accepted Answer · 2018-07-06 16:46:24Z

Just do the below changes in your code and it will work:

When calling searchAndGetIndex function, change name to 'name' because object keys are strings.
Change x.key to x[key]
Change getFilterResult to getIndex in if condition

Here is running code snippet:

var array= [{
    name: 'Joe',
    surname: 'Smith'
}, {
    name: 'John',
    surname: 'Smith'
}];


function searchAndGetIndex(arrayName, key, value) {
    var cloneArray = [...arrayName];
    var saveIndex = [];

    for(var i = 0; i < arrayName.length; i++) {
        var getIndex = cloneArray.findIndex(x => x[key] == value); // x.key is my problem
        if(getIndex !== -1) saveIndex.push(getIndex + i);
        cloneArray.splice(getIndex , 1);
    }

    return saveIndex;
}

console.log(searchAndGetIndex(array, 'name', 'John')); // 1

Charles Stover · Accepted Answer · 2018-07-06 16:35:47Z

0

When you call searchAndGetIndex, name should be 'name', because name is a variable that does not exist. You are passing the string 'name', because object keys are strings.

var myObject = { test: 2 };
myObject[test];   // variable test is undefined
myObject.test;    // 2
myObject['test']; // 2

When you call findIndex, your x.key should be x[key], because x.key means to check the property named key on x, whereas x[key] means to check the property with the name that is the value of the variable key (in this case, the property named 'name').

var myObject = { key: 1, test: 2 };
var key = 'test';
myObject.key;     // 1
myObject['key'];  // 1
myObject[key];    // 2
myObject['test']; // 2

answered Jul 6, 2018 at 16:35

Charles Stover

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