Emulating switch/case Statements in Python with Dictionaries: JavaScript version

python-alt-switch-case.js

'use strict';

/*
    https://www.youtube.com/watch?v=gllUwQnYVww
    Emulating switch/case Statements in Python with Dictionaries
*/

const execFunc = (operand = 'add', a = 1, b = 1) => {
    const getOperand = (name, obj) => {
        if(typeof obj[name] !== 'function') {
            return () => {};
        }
        return obj[name]();
    };
    return getOperand(operand, {
        add: () => a + b,
        sub: () => a - b,
        mul: () => a * b,
        div: () => a / b
    });
};

const operations = [
    {
        operand: 'add',
        values: [2, 1]
    },
    {
        operand: 'sub',
        values: [2, 1]
    },
    {
        operand: 'mul',
        values: [2, 3]
    },
    {
        operand: 'div',
        values: [2, 2]
    }
];

for(let op of operations) {
    let { operand } = op;
    let [a, b] = op.values;
    console.log(execFunc(operand, a, b));
}