JSON - Javascript - How to search array item by searching list of values

Question

I have json array is as below

[
    {
        French: 'Hello',
        Spanish: 'Hello1',
        english:'Hello2'
    },{
        French: 'Hello3',
        Spanish: 'Hello4',
        english:'Hello5'
    },{
        French: 'Hello6',
        Spanish: 'Hello7',
        english:'Hello8'
    },{
        French: 'Hello9',
        Spanish: 'Hello10',
        english:'Hello81'
    }
];

In Javascript array If I wanted to search items based on values

ex If I give Hello6 as finding string I should get 3rd item in the list. I would like generic search rather searching each and every element.

"...generic search rather searching each and every element" What does that mean? What have you tried? Where are you stuck? — cookie monster
– cookie monster, Commented Jan 31, 2014 at 15:46

Danilo Valente · Accepted Answer · 2014-01-31 15:45:28Z

2

You can try this:

function findIndex(arr, str) {
    for (var i = 0; i < arr.length; i++) {
        for (var key in arr[i]) {
            if (arr[i][key] === str) {
                if (arr[i].hasOwnProperty(key) {
                    return arr[i];
                }
            }
        }
    }
    return null;
}

This method consists of an array search with a normal for loop and then, for each element of this array, we perform a for..in loop.

answered Jan 31, 2014 at 15:45

Danilo Valente

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3 Comments

dfsq Over a year ago

It's probably unnecessary to check for ownProperty in json object. However it's a good habit.

Danilo Valente Over a year ago

Indeed, it is. I just put it there because I wanted to write a generic function that can search through any object, either JSONs or not.

cookie monster Over a year ago

It's not really generic when you use .hasOwnProperty() like that. It's now specific to the only the case where you're certain you don't want inherited properties. To make it generic, you'd need a second parameter used to indicate if it should be restricted to own properties.

Dalorzo · Accepted Answer · 2014-02-02 06:00:54Z

1

Here is my sample using native functions:

var items = [/*your sample*/];
var myValue = "Hello6";

var result = items.filter(function (item) { 
    return Object.keys(item).some(function (property) { 
        return item[property] === myValue; 
    });
});

edited Feb 2, 2014 at 6:00

user1636522

answered Jan 31, 2014 at 15:49

Dalorzo

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Comments

Mehran Hatami · Accepted Answer · 2014-01-31 16:02:34Z

0

you can use filter function:

var val = "Hello6";
//if you want to filter the array
resultArray = jsonArray.filter(function(obj, index){
    for(var key in obj){
        if(obj[key]==val) return obj;
    }
});

var indexes=[];
//if you want to find the results
jsonArray.forEach(function(obj, index){
    for(var key in obj){
        if(obj[key]==val){
            indexes.push(index);
            break;
        }
    }
});

edited Jan 31, 2014 at 16:02

answered Jan 31, 2014 at 15:49

Mehran Hatami

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Comments

score 0 · Accepted Answer · 2014-01-31 16:57:49Z

0

You could use good old for loops :

function find(array, fn) {
    for (var i = 0, l = array.length; i < l; i++) {
        if (fn(array[i]) === true) return array[i];
    }
}

Usage example :

var a = [{ a: 1 }, { a: 2 }, { a: 3 }];
var result = find(a, function (item) {
    return item.a === 2;
});
result; // { a: 2 }

With a more complex array :

var a = [
    { a: 1, b: 2 }, 
    { a: 3, b: 4 }, 
    { a: 5, b: 6 }
];
var result = find(a, function (item) {
    for (var k in item) {
        if (item[k] === 4) return true;
    }
});
result; // { a: 3, b: 4 }

edited Jan 31, 2014 at 16:57

answered Jan 31, 2014 at 16:11

user1636522

2 Comments

Dalorzo Over a year ago

=== true. Do you think it is necessary?

user1636522 Over a year ago

No it's not. I just think it's a bit easier for the OP to understand.

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