[1, 2, 3] + [4, 5, 6] // "1,2,34,5,6"
Being able to concatenate two comma-seperated strings without a comma in the middle is such a common use case. I'm glad the JS develpoers thought to optimise for the most common use case.
— Gaelan
created by Brian LeRoux & Andrew Lunny. sparodically uncurated by David Trejo.
wtfjs is free software. get the source on github.