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Background to 4 Array Map

By the end, you'll understand the fundamental behaviors of 00:00:00 introduciton 00:00:16 example 1 00:02:13 example 2 00:03:58 example 3 // . There is a bug in the code at 9:52 seconds. It should be "size", not "keys.length". Thanks to Josh Zhang Mentorship to six figure software engineer - ⚙️ Backend Engineering Mind In this video we will look at some of the new data structures. ES6 Introduced

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Last Updated: June 3, 2026

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