Partial Application

partial.js

// Some assertion functions we can play with
function assert(condition, message) {
  if(!condition) {
    throw new Error(message);
  }
}
 
function assert_equal(obj1, obj2) {
  assert(obj1 === obj2, 'Expected '+obj1+' to equal '+obj2+'.');
}

/***************************************************************************
 * Implement partial application:
 */

function partial(fn) {
	// fill in here
}

function sum3(a,b,c) { return a+b+c; }

var sumWith5 = partial(sum3, 5);

assert_equal(typeof sumWith5, 'function');
assert_equal(sumWith5(0,0), 5);
assert_equal(sumWith5(10,0), 15);
assert_equal(sumWith5(3,3), 11);