Monday, January 28, 2019
Most efficient way to check if a variable is an array in JavaScript?
Answer
I was reading this question about how to check if a variable is an Array in Javascript, and this answer proposes several solutions:
1. variable.constructor === Array
2. Array.isArray(variable)
3. variable instanceof Array
The post has several updates and they touch on the efficiency of the different solutions, but between the post and its comments it isn't entirely clear which solution is the most efficient. I'm hoping to clarify which of these solutions provides the most efficient check for whether or not a variable is an Array in JavaScript.
Edit: I'd like to note that this question is about the performance of checking whether or not a variable is an Array and not how to check if a variable is an Array. Considering all the noise in the linked question, I believe there is value to the question.
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