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edited Jan 6, 2022 at 20:20

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JavaScript, 40 bytes

f=a=>a/a||Math.max(a.length,...a.map(f))

Try it online!

JavaScript, 43 bytes

f=a=>Math.max(~~a.length,...a.map?.(f)??[])

f=a=>Math.max(~~a.length,...a.map?.(f)??[])

console.log(f([]))
console.log(f([1,2,3]))
console.log(f([[1,2,3]]))
console.log(f([1,2,[],1]))
console.log(f([1,[1,[8,2,[1,2],5,4,9]],2,[],3]))

JavaScript, 43 bytes

f=a=>Math.max(~~a.length,...a.map?.(f)??[])

f=a=>Math.max(~~a.length,...a.map?.(f)??[])

console.log(f([]))
console.log(f([1,2,3]))
console.log(f([[1,2,3]]))
console.log(f([1,2,[],1]))
console.log(f([1,[1,[8,2,[1,2],5,4,9]],2,[],3]))

JavaScript, 40 bytes

f=a=>a/a||Math.max(a.length,...a.map(f))

Try it online!

JavaScript, 43 bytes

f=a=>Math.max(~~a.length,...a.map?.(f)??[])

f=a=>Math.max(~~a.length,...a.map?.(f)??[])

console.log(f([]))
console.log(f([1,2,3]))
console.log(f([[1,2,3]]))
console.log(f([1,2,[],1]))
console.log(f([1,[1,[8,2,[1,2],5,4,9]],2,[],3]))

Source Link

created Jan 6, 2022 at 16:10

Unmitigated

2.8k
1
5
14

JavaScript, 43 bytes

f=a=>Math.max(~~a.length,...a.map?.(f)??[])

f=a=>Math.max(~~a.length,...a.map?.(f)??[])

console.log(f([]))
console.log(f([1,2,3]))
console.log(f([[1,2,3]]))
console.log(f([1,2,[],1]))
console.log(f([1,[1,[8,2,[1,2],5,4,9]],2,[],3]))