A simple version of bind() in js.

bindWithParams.js

/**
 * Concat the parameters passed in when binding and the parameters when the new
 * binded function takes
 *
 * @param {*} context
 * @returns
 */
Function.prototype.bindWithParam = function(context) {
  // take the function
  let fn = this;
  let args = [...arguments].slice(1);

  return function() {
    //this is the arguments passed in when the binded function invoked
    let bindFuncArgs = [...arguments];
    fn.apply(context, args.concat(bindFuncArgs));
  };
};