Lodash prototype.plant method

_.prototype.plant(value)

var _ = require('lodash');  
function square(n) {
   return n * n;
}
 
var wrapped = _([1, 2]).map(square);
var other = wrapped.plant([3, 4]);
 
console.log(other.value());
console.log(wrapped.value());

\>node tester.js

[ 9, 16 ]
[ 1, 4 ]