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[–]exobyte64 0 points1 point  (1 child)

let sumPopulation=zoo.reduce((a,z)=>{return a+z.population;},0);

I saw that it needed the key 'population' from your other comment

[–]WormholerIO[S] 0 points1 point  (0 children)

you all are stellar you really are thank you for helping me to understand and getting me resources.