30 seconds of code

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bindAll

objectfunctionintermediate

Binds methods of an object to the object itself, overwriting the existing method.

Use Array.prototype.forEach() to return a function that uses Function.prototype.apply() to apply the given context (obj) to fn for each function specified.

const bindAll = (obj, ...fns) =>
  fns.forEach(
    fn => (
      (f = obj[fn]),
      (obj[fn] = function() {
        return f.apply(obj);
      })
    )
  );