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var R = require('../source');var eq = require('./shared/eq');

describe('memoizeWith', function() {  it('calculates the value for a given input only once', function() {    var ctr = 0;    var fib = R.memoizeWith(R.identity, function(n) {      ctr += 1;      return n < 2 ? n : fib(n - 2) + fib(n - 1);    });    var result = fib(10);    eq(result, 55);    eq(ctr, 11); // fib(0), fib(1), ... fib(10), no memoization would take 177 iterations.  });
  it('handles multiple parameters', function() {    var f = R.memoizeWith(function(a, b, c) {      return a + b + c;    }, function(a, b, c) {return a + ', ' + b + c;});    eq(f('Hello', 'World' , '!'), 'Hello, World!');    eq(f('Goodbye', 'Cruel World' , '!!!'), 'Goodbye, Cruel World!!!');    eq(f('Hello', 'how are you' , '?'), 'Hello, how are you?');    eq(f('Hello', 'World' , '!'), 'Hello, World!');  });
  it('does not rely on reported arity', function() {    var identity = R.memoizeWith(R.identity, function() { return arguments[0]; });    eq(identity('x'), 'x');    eq(identity('y'), 'y');  });
  it('can be applied to nullary function', function() {    var count = 0;    var f = R.memoizeWith(R.identity, function() {      count += 1;      return 42;    });    eq(f(), 42);    eq(f(), 42);    eq(f(), 42);    eq(count, 1);  });
  it('can be applied to function with optional arguments', function() {    var count = 0;    var f = R.memoizeWith(R.concat, function concat(a, b) {      count += 1;      switch (arguments.length) {        case 0: a = 'foo';        case 1: b = 'bar';      }      return a + b;    });    eq(f(), 'foobar');    eq(f(), 'foobar');    eq(f(), 'foobar');    eq(count, 1);  });
  it('retains arity', function() {    var f = R.memoizeWith(R.concat, function(a, b) { return a + b; });    eq(f.length, 2);  });
});