Find a value in a JavaScript object

Question

I have a javascript object which looks like this:

tabAndFieldLink: {
    'key1': ['value11', 'value12', 'value13', 'value14', 'value15'],
    'key2': ['value21', 'value22', 'value23', 'value24', 'value25', 'value26', 'value27'],
    'key3': ['value31', 'value32', 'value33', 'value34'],
    'key4': ['value41', 'value42'],
}

What I want

I have the value value22 and I want to get it's key i.e. key2.

What I tried

for (err in errorArray) {
    //err contain the value i.e. value22
    var resultObject = search(err, tabAndFieldLink);
    console.log("The result is :", resultObject);
}

function search(nameKey, myArray) {
    for (var i = 0; i < myArray.length; i++) {
        if (myArray[i].indexOf(nameKey) !== -1) {
            return myArray[i];
        }
    }
}

But it is printing "The result is :", undefined. How can I get the key?

Thanks.

Satpal · Accepted Answer · 2017-01-16 09:47:21Z

3

You should use for...in statement to iterates over the enumerable properties of object tabAndFieldLink and as you need key return it.

for (key in obj) {
    if (obj[key].indexOf(nameKey) !== -1) {
        return key;
    }
}

var tabAndFieldLink = {
  'key1': ['value11', 'value12', 'value13', 'value14', 'value15'],
  'key2': ['value21', 'value22', 'value23', 'value24', 'value25', 'value26', 'value27'],
  'key3': ['value31', 'value32', 'value33', 'value34'],
  'key4': ['value41', 'value42'],
}

//err contain the value i.e. value22
var err = 'value22';
var resultObject = search(err, tabAndFieldLink);
console.log("The result is :", resultObject);

function search(nameKey, obj) {
  for (key in obj) {
    if (obj[key].indexOf(nameKey) !== -1) {
      return key;
    }
  }
}

edited Jan 16, 2017 at 9:47

answered Jan 16, 2017 at 9:44

Satpal

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Comments

Daksh Gupta · Accepted Answer · 2017-01-16 10:03:23Z

There are many inbuilt functional behavior present in the Javascript, which can be used in cases like this.

Here is the code using arrays filter

var tabAndFieldLink =  {
    'key1': ['value11', 'value12', 'value13', 'value14', 'value15'],
    'key2': ['value21', 'value22', 'value23', 'value24', 'value25', 'value26', 'value27'],
    'key3': ['value31', 'value32', 'value33', 'value34'],
    'key4': ['value41', 'value42'],
}


function getKey(checkValue) {
    for (key in tabAndFieldLink) {
        var newArr = tabAndFieldLink[key].filter(function(value){
            return value == 'value22';
        });
        if(newArr.length > 0) {
            console.log("Found......", key);
            return key;
            }
    }
}

console.log(getKey('value22'));

damianfabian · Accepted Answer · 2017-01-16 09:53:26Z

0

You could use find and Object Keys function

var data = {
    'key1': ['value11', 'value22', 'value13', 'value14', 'value15'],
    'key2': ['value21', 'value22', 'value23', 'value24', 'value25', 'value26', 'value27'],
    'key3': ['value31', 'value32', 'value33', 'value34'],
    'key4': ['value41', 'value42'],
}

function findValue(search){
var result = []
Object.keys(data).forEach(function(key){
 var r = data[key].find(function(value){ 
           return value === search 
        })
 r && result.push(key)
})
console.log(result)
}

findValue("value22")

answered Jan 16, 2017 at 9:53

damianfabian

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Comments

Nina Scholz · Accepted Answer · 2017-01-16 09:54:20Z

You could check with Array#some, if the value is in the array with a specific key, then return that key.

function  getKey(object, value) {
    var key;
    Object.keys(object).some(function (k) {
        if (object[k].indexOf(value) !== -1) {
            key = k;
            return true;
        }
    });
    return key;
}

var object = { key1: ['value11', 'value12', 'value13', 'value14', 'value15'], key2: [ 'value21', 'value22', 'value23', 'value24', 'value25', 'value26', 'value27'], key3: ['value31', 'value32', 'value33', 'value34'], key4: ['value41', 'value42'] },
    find = 'value22',
    key = getKey(object, find);

console.log(key);

ES6 with Array#find and Array#includes

function  getKey(object, value) {
    return Object.keys(object).find(k => object[k].includes(value));
}


var object = { key1: ['value11', 'value12', 'value13', 'value14', 'value15'], key2: [ 'value21', 'value22', 'value23', 'value24', 'value25', 'value26', 'value27'], key3: ['value31', 'value32', 'value33', 'value34'], key4: ['value41', 'value42'] },
    find = 'value22',
    key = getKey(object, find);

console.log(key);

Glenn · Accepted Answer · 2017-01-16 09:58:18Z

0

The tabAndFieldLink structure is a Hash containing key value pairs. Each value is an Array.

Navigate the structure as per the snippet below.

var tabAndFieldLink = {
  'key1': ['value11', 'value12', 'value13', 'value14', 'value15'],
  'key2': ['value21', 'value22', 'value23', 'value24', 'value25', 'value26', 'value27'],
  'key3': ['value31', 'value32', 'value33', 'value34'],
  'key4': ['value41', 'value42'],
};

var resultObject = search("value22", tabAndFieldLink);
console.log("The result is :", resultObject);

function search(nameKey, myHash) {
  for (var key in myHash) {
    if (myHash[key].indexOf(nameKey) !== -1) {
      return key;
    }
  }
}

edited Jan 16, 2017 at 9:58

answered Jan 16, 2017 at 9:50

Glenn

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