Display One Record from State in React JS | JavaScript Filter and Map Together
Use filter and map together in javascript or react js to display required one record from object or state. The Map object holds key-value pairs and remembers the original insertion order of the keys. Any value (both objects and primitive values) may be used as either a key or a value. A Map object iterates its elements in insertion order. Object is similar to Map. Both let you set keys to values, retrieve those values, delete keys, and detect whether something is stored at a key. The filter method creates an array filled with all array elements that pass a test (provided by a function). Map and Filter do not change the original array.
If we want to display each record from a JavaScript object or Array, we can do it by using JavaScript map. What if we want to display only single required item from object? For that we can use filter and map together. items dot filter dot map. First we will extract the required key value pair or required record from object. Then by using map we can display it in same sequence. We can chain map and filter methods.
We can do similar thing in react js. We have used useState in react to keep our state object. We can use map and filter for state object in react js. To display all entries from state, we can use map. To display required single record from state in react js, we will use filter and then map for the same object in sequence. If you want to display all items from state let's say the requirement is this use simple map method. If you want to display a selected record use filter and map simultaneously. First filter the item that you want to display then use map and display the item from that record.
This JavaScript tutorial answers following questions:
What is the difference between map and filter in javascript?
How to use map and filter methods in javascript and react js?
How to get one value from object in javascript?
How to get one value from array in javascript?
How to get one value from state in react js?
How to use map and filter simultaneously?
How to map and filter an array at the same time?
What is difference between map and filter in javascript?
We have shown you doing same thing in javascript and in react js.
Thank You!
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