请教大佬 new Set([1,2,3].push(1))为什么会报 TypeError: 4 is not iterable

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在看 Set 的源码，还没看出来为什么有大佬知道的话可以指导下么

3 replies

myl0204

Nov 28, 2018

[1,2,3].push(1) 返回 4
new Set(4) // error

SoloCompany

Nov 28, 2018

new Set([1,2,3].concat(4))

orcusfox

Nov 28, 2018 via iPhone

push 只返回数组长度