THE SOLUTION

array.reduce((a, v) => Object.assign(a,v), {})

THE EXPLANATION

Array.reduce() loops throw the initial array aimed to "reduce" it into a single object. The reduce method allows you to store the return value of each of your iterations. It requires an initial value which in this case it will be the empty object {} that we will be filling up with our array.

Then we use Object.assign(target, source) which concatenates two objects together returning the concatenated object which in this case it will saved into our accumulator and be used as a target for the next iteration giving you when it finishes the constructed final object. As you have objects as the keys of the array, each single property Object(source) will be "assigned" to a master one (target) that will be collecting all of them into one.

array1 =[ {1:'Eat'},{2:'Shower'},{3:'Shave'}]
obj1 = array1.reduce((a, v) => Object.assign(a,v), {})
console.log(obj1)

The easiest way to achieve this is to reduce the list of objects into a single object.

const
  input = [{ 1: 'Eat' }, { 2: 'Shower' }, { 3: 'Shave' }],
  output = input.reduce((acc, obj) => ({ ...acc, ...obj }), {});

console.log(output);

.as-console-wrapper { top: 0; max-height: 100% !important; }

fromEntries and a flatMap seems to do the trick nicely

const array1 = [ {1:'Eat'},{2:'Shower'},{3:'Shave'}]
const obj1 = Object.fromEntries(array1.flatMap(item => Object.entries(item)))

console.log(obj1)