Question THREE.Mesh input arguments

Questions
1

Hello Friends,

Normally I am using these codes ,

const geometry = new THREE.BoxGeometry(1, 1, 1);
const material = new THREE.MeshBasicMaterial({color: 0x44aa88});
const mesh = new THREE.Mesh(geometry, material);

However,I saw the following type of code somewhere and I am confused.
How does the following code work ?
Because Function CreateMaterial() has no return type but we are calling CreateMaterial() function inside THREE.Mesh
What is the logic of using code like that

function CreateMaterial(){
    const material = new THREE.MeshBasicMaterial({color: 0x44aa88});
}

const geometry = new THREE.BoxGeometry(1, 1, 1);
const mesh = new THREE.Mesh(geometry,CreateMaterial());
2

That code shouldn’t work. undefined will be passed as the material and a default material will be used.

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