arra1 = arra1.map(item => {
const item2 = arra2.find(i2 => i2.transid === item.transid);
return item2 ? { ...item, ...item2 } : item;
});
Map all elements in arra1
into arra1
itself. On the mapping function try to find the correlative item in arra2
and merge the two items with object spread if its found, if not, return the original item. Notice that spreading item2
last is crucial to the merge, so you overwrite with the values from item2
but keep those in item1
that were not overwritten.