What\'s the Most Efficient Way to Convert an HTMLCollection to an Array in JavaScript?

Efficient HTMLCollection to Array Conversion

Converting an HTMLCollection to an array is a common task in front-end development. While manually iterating through and pushing each item is a straightforward approach, there are more optimized methods to consider.

Native Code Approach

One efficient alternative is to utilize the native Array.prototype.slice.call() method:

var arr = Array.prototype.slice.call(htmlCollection)

This method effectively converts the HTMLCollection to an array by slicing it.

Concise Expression

A more concise expression with effectively the same functionality is:

var arr = [].slice.call(htmlCollection);

Array.from() Method

ECMAScript 2015 (ES 6) introduced the Array.from() method, which provides an explicit way to convert from an iterable to an array:

var arr = Array.from(htmlCollection);

Spread Operator

ES 6 also offers the spread operator, which can be used functionally equivalent to Array.from():

var arr = [...htmlCollection];

Performance Considerations

A performance comparison of these methods on NodeList shows no significant differences.

Conclusion

These methods offer efficient ways to convert an HTMLCollection to an array. The choice of method may depend on the specific scenario, with newer ES 6 features such as Array.from() and the spread operator providing簡潔 and modern alternatives.

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