Understand Big O notation [1] and how to use more technical JavaScript features like .map [2] and .reduce [3]. I get asked these frequently, and it was never m

Understand Big O notation [1] and how to use more technical JavaScript features like .map [2] and .reduce [3]. I get asked these frequently, and it was never mentioned to me when I asked for advice on how to prepare. This may be specific to senior developer positions. [1] https://en.wikipedia.org/wiki/Big_O https://en.wikipedia.org/wiki/Big_O [2] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe... [3] https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce https://developer.mozilla.org/en-US/docs/Web/JavaScript/Refe...