Question

110

Compare a String to a Key in a JavaScript Object

rated 0 times [ 117] [ 7] / answers: 1 / hits: 42595 / 8 Years ago, fri, november 18, 2016, 12:00:00

How do I compare a string to a JavaScript object's key? For example, here is a string and a JavaScript object. I want to compare the string (in this case, the value of myString is Item1) to a key in this JavaScript object (in this case, the keys are Item1 and Item2):

var myString = Item1;



var jsObject = 

{

    Item1:

    {

        apples: red,

        oranges: orange,

    },

    Item2:

    {

        bananas: yellow,

        pears: green

    }

};

If I create a 'for' loop and run the contents of object through the loop, I want to compare the keys in this object to a string.

for (var x = 0; x < Object.keys(jsObject).length; x++)

{

    if (myString == /* What do I put here to compare to grab Item1 or Item2? */)

    {

        // Do stuff

    }

}

Answers

Only authorized users can answer the question. Please sign in first, or register a free account.

ravenl

Add To Favorites

Follow

Total Points: 338

Total Questions: 107

Total Answers: 112

Location: Belize

Member since Mon, Jun 20, 2022

2 Years ago

ravenl questions

1 TypeError: e.preventDefault is not a function on React Hook Form using EmailJs

Wed, Sep 1, 21, 00:00, 3 Years ago

1 Vue @change event not working in < b-form-datepicker/>

Thu, Feb 18, 21, 00:00, 3 Years ago

1 Image type in typescript

Tue, Jan 12, 21, 00:00, 3 Years ago

1 How can I append HTML code using JavaScript?

Tue, Mar 17, 20, 00:00, 4 Years ago

1 make the first tab the active tab when open a bootstrap modal

Sun, Feb 16, 20, 00:00, 4 Years ago

View All

answered 8 Years ago julissaimana · Accepted Answer

var myString = Item1;



var jsObject = 

{

    Item1:

    {

        apples: red,

        oranges: orange,

    },

    Item2:

    {

        bananas: yellow,

        pears: green

    }

};



var keys = Object.keys(jsObject); //get keys from object as an array



keys.forEach(function(key) { //loop through keys array

  console.log(key, key == myString)

});

You could use a for loop, but you'd have to store the array of keys somewhere.

var myString = Item1;



var jsObject = 

{

    Item1:

    {

        apples: red,

        oranges: orange,

    },

    Item2:

    {

        bananas: yellow,

        pears: green

    }

};



var keys = Object.keys(jsObject);



for (var i = 0; i < keys.length; i++) {

  if (myString == keys[i])

    console.log('match: ', keys[i])

}

Optionally, you can use for..in to get the keys as well.

var myString = Item1;



var jsObject = 

{

    Item1:

    {

        apples: red,

        oranges: orange,

    },

    Item2:

    {

        bananas: yellow,

        pears: green

    }

};



for (var key in jsObject) {

  console.log(key, key == myString)  

}