Confused how createSelector works

I'm still new to javascript and I'm having trouble understanding how state is passed to createSelector and then to the input selectors. For example, in the code below we have a selector computeDiff that uses createSelector from reselect library and an input selector myUserInputSelector.

export const myUserInputsSelector = (state) => {
  return state.userInputs;
}  

const computeDiffOfSmallestLargest = ( myUserInputs ) => {
  let largest = myUserInputs[0];
  let smallest = myUserInputs[0];

  myUserInputs.forEach( input => {
    if(input > largest) largest = input;
    if(input < smallest) smallest = input;
  });

  return largest - smallest;
}

export const computeDiff = createSelector(
  [myUserInputsSelector],
  computeDiffOfSmallestLargest
);

So to test this selector we have the following test.

describe ('computeDiffOfSmallestLargest', () => {
  it('computes the difference between largest and smallest user inputs in global array', () => {
    const state = {
      appState: 'OFF',
      screenState: {
        min: 0,
        max: 0
      },
      userInputs: [144, 44, 99]
    }

    const diff = computeDiff(state);
    expect(diff).to.be.eq(100);
  })
});

So my question is how is state argument to comuputeDiff getting to myUserInputSelector? createSelector takes an array of input selectors as first parameter and transform function as the second, not a state parameter. What am I missing here?