JavaScript How to construct a method chain from an array of method names

Use reduce to iterate over the array and call each function, and pass along the return value to the next iteration as the accumulator:

// using just a single object to make the indentation much more readable:
const obj = {
  foo(arg) {
    console.log('foo called with ' + arg);
    return this;
  },
  bar(arg2) {
    console.log('bar called with ' + arg2);
    return this;
  },
  foobar(argA, argB) {
    console.log('foobar called with ' + argA + ' ' + argB);
    return this;
  },
  execute(arg5) {
    console.log('execute called with ' + arg5);
    return this;
  }
};

const arr = [
  ["foo", ["asdf"]],
  ["bar", ["other"]],
  ["foobar", [123, "hi"]],
  ["execute", ["today"]]
];
arr.reduce((a, [key, args]) => a[key](...args), obj);
Answer:1

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