When to Use find() or filter() in Javascript

When to Use find() or filter() in Javascript

When we handle an array in JavaScript, we may need to find a single item in the array collection. However, it shouldn't be too difficult if we use the appropriate methods. In this post, i gives you the idea of when to use find() versus filter() in Javascript.

In this post, i gives you the idea of when to use find() versus filter() in Javascript.

When we handle an array in JavaScript, we may need to find a single item in the array collection. This may sound tedious, however, it shouldn't be too difficult if we use the appropriate methods.

Find and Filter

There are several alternatives to find the required values from the array, but here, I am going to use the find and filter methods in JavaScript.

var requests = [{  
    App: 'Adobe',  
    Count: 10  
}, {  
    App: 'Apple',  
    Count: 12  
}, {  
    App: 'Amazon',  
    Count: 5  
}, {  
    App: 'Microsoft',  
    Count: 2  
}];  

The find() method returns the first value that matches from the collection. Once it matches the value in findings, it will not check the remaining values in the array collection.

requests.find(function(item) {  
    return item.App == "Apple"  
});  
  
//output: {App: "Apple", Count: 12}  

The filter() method returns the matched values in an array from the collection. It will check all values in the collection and return the matched values in an array.

requests.filter(function(item) {  
    return item.App == "Apple"  
});  
  
//output: [ {App: "Apple", Count: 12} ]  

The find() method doesn’t work in IE <= 11. The filter() method works in all browsers, including IE9+.

From the collection of filter() method result, you can get the first matched value using the below snippet. This method overcomes the IE combability issue of the find() method.

requests.filter(function(item) {  
    return item.App == "Apple"  
})[0];  
  
//output: {App: "Apple", Count: 12}  
Conclusion

The find() method is a better option to use across modern browsers, but if you care about the IE browser, use the filter() method.

Thank you for reading !

Functional Programming for JavaScript Developers

Functional Programming for JavaScript Developers

Functional Programming for JavaScript Developers. Learn Functional Programming and how it enables developers to move from imperative to declarative programming. Solidify your knowledge of functional JavaScript programming, including objects, arrays, and prototypes. Learn higher-order functions, closures, scope, master key functional methods like map, reduce and filter and promises and ES6+ asynchronous JavaScript. Learning how to build and manage asynchronous functional programs is perhaps the most important part of becoming an effective JavaScript programmer.

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Learn functional programming and how it enables developers to move from imperative to declarative programming

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Programming a Javascript Simon Game Tutorial

Programming a Javascript Simon Game Tutorial

In this javascript tutorial, I recorded myself live programming an html5 javascript simon game.

In this javascript tutorial, I recorded myself live programming an html5 javascript simon game.

For those who don't know, I'm a full stack web developer who has been in the industry for over 5 years now. There is a lot of things I have learned along the way and I'd like to share that knowledge with anyone wanting to learn!

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Python Programming Tutorials For Beginners

Python Programming Tutorials For Beginners

Python Programming Tutorials For Beginners

Description
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know basic programming concept and skill
build 6 text-based application using python
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To know more: