Node Js Array.includes Not Working As Expected

I have the following code which should filter one dynamic array (up to 300 thousands elements) from all elements not contained in another constant array: orders[] // is already fi

Solution 1:

for (let scheme in schemes) 

Thats how you iterate over keys in an object. Rather iterate over the entries in an array:

for (let scheme of schemes) 

Additionally you should consider using the Set for lookup as its much faster. And map and filter might be useful:

const materials = newSet(schemes.map(scheme => scheme.typeID));

orders = orders.filter(el => materials.has(el.type_id));