Javascript object get value by key

Ask Question Asked years, months ago. Active months ago. Viewed 187k times 83. A but i want to get by through a variable like this.

Each property is then checked if they are equal to the value to be found.

If the value matches, then the property is returned. This is the key to the value of the object. But we can also access the value using a variable key.

It takes the object that you want to iterate over as an argument and returns an array containing all properties names (or keys ). Entries(array) on the resulting array to turn it back into an object. Using Variable Key Example. In the following example, instead of Dot and Bracket notations, a variable key is used to access the value of an object.

Usually, when we traverse through an object we traverse through its keys and can easily get the corresponding value.

However, the reverse is. It returns the values of all properties in the object as an array. JavaScript utility function that returns the list of values of object.

Otherwise you should check the length of the resulting array. An array of strings that represent all the enumerable properties of the given object. An example of this is in the foIn method in mout.

These get values from an object and avoid enumerating over the prototype chain. How to check whether a strin. Parameters Used: obj : It is the object whose enumerable properties are to be returned.

Examples of the above function are provided below. Check if a myString exist in the array myKeys using native. ES no prototype mutations or external libraries. They are widely used in modern Javascript to copy data also.

This method shows how to combine two different arrays into one array of key - value maps. I just trying to get values from the keys and put them in an array.

I can get the keys but how do I get the values.

Get key value array object. Object) to get the keys. Use this: var matchingKeys = myKeys. Functions can be Key or Value Too! Processing an array? The Map interface of Java Collections offers a method called entrySet (). The array can be looped using a for-loop to get all the values of the object. Therefore, the keys are not required to be known to get all the property values. Name) method to get access to all the keys of object. Javascript map() method to get values.

I have a function that is passed both the object, and a pr. See the following example. It will give us the same output. Use comma (,) to separate multiple key - value pairs.

Declare the values you want to find. Get the enumerator of the dictionary. If MoveNext returns false, there are no more elements so not all values could be found.

The name:value pairs can consist of properties that may contain any data type — including strings, numbers, and Booleans — as well as methods, which are functions contained within an object. Keys and values are separated by a colon.