Exploring the dissimilarity between the methods find() and filter().shift() in JavaScript

Question

Exploring the dissimilarity between the methods find() and filter().shift() in JavaScript

Recently, I made the decision to cut down on my use of underscore/lodash in some of my projects and found that browser support for the full functionality of the find method is lacking. What sets the ES6 method find apart from using .shift() with filter results?

const user = users.find(function() { ... } );

or

const user = users.filter(function() { ... } ).shift();

I understand that there might be optimizations in the "find" method (stopping iteration at first match), but could I encounter unexpected results with the second approach? Is it advisable to use the polyfill instead? Why?

javascript ecmascript-6

Answer 1

Answer №1

Despite the noticeable overhead, it is true that the results can vary. The filter function continues to iterate through the entire array and invokes its callback on each item, while find stops as soon as it finds a match. This distinction becomes important when an exception is thrown during iteration of the remaining items.
In my opinion, there is no compelling reason not to utilize find.

Answer 2

Despite the noticeable overhead, it is true that the results can vary. The filter function continues to iterate through the entire array and invokes its callback on each item, while find stops as soon as it finds a match. This distinction becomes important when an exception is thrown during iteration of the remaining items.
In my opinion, there is no compelling reason not to utilize find.

Answer 3

Answer №2

Consider implementing a polyfill; instead of using

users.filter(function() { ... } ).shift();

, which discards cycles and triggers unnecessary garbage collection.

filter scans the entire array and generates a new array
shift then modifies all indexes on the temporary array

A more efficient alternative would be to utilize

users.filter(function() { ... } )[0]

Answer 4

Consider implementing a polyfill; instead of using

users.filter(function() { ... } ).shift();

, which discards cycles and triggers unnecessary garbage collection.

filter scans the entire array and generates a new array
shift then modifies all indexes on the temporary array

A more efficient alternative would be to utilize

users.filter(function() { ... } )[0]

Exploring the dissimilarity between the methods find() and filter().shift() in JavaScript

Answer №1

Answer №2

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