3 node modules patterns

constructor

'use strict';

function Foo(numParam) {
    this.bar = numParam || 0;
}

Foo.prototype.publicMethod = function() {
    let temp = 1 + this.bar;
    return temp;
};

module.exports = Foo;

/* use: 
const Foo = require('./foo');
let instFoo = new Foo(4);
console.log(instFoo.publicMethod());
*/

instance

'use strict';

function Foo(numParam) {
    this.bar = numParam || 0;
}

Foo.prototype.publicMethod = function() {
    let temp = 1 + this.bar;
    return temp;
};

module.exports = new Foo(5);

/* use:
const instFoo = require('./foo');
console.log(instFoo.publicMethod());
*/

reveal-pattern

'use strict';

const foo = (function() {
    const module = {};
    const self = module;
    
    module._privateMethod = (numParam)=> {
        let temp = 1 + numParam;
        return temp;
    };
    
    module.publicMethod = (numParam)=> {
        let bar = self._privateMethod(numParam);
        return bar;
    };
    
    return {
        publicMethod: module.publicMethod
    };

} )();

module.exports = foo;