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function partial(fn) {
  
  var args = [];
  
  for (var i = 1; i < arguments.length; i++) {
    args.push(arguments[i]);
  }
  
  return function() {
    
    var args1 = [];
    
    for (var i = 0; i < arguments.length; i++) {
      args1.push(arguments[i]);
    }
    
    var allArgs = args.concat(args1);
    
    return fn.apply(null, allArgs);
  };
}
function add(a, b) { 
  return a + b; 
}
function mult(a, b, c, d) { 
  return a * b * c * d; 
}
var mult23 = partial(mult, 2, 3);
console.log(mult23(4, 5));
var add5 = partial(add, 5);
console.log(add5(2));
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anonymouspro
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