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Make lift update on undefined #133

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Make lift update on undefined #133

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3 changes: 2 additions & 1 deletion module/lift/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -4,7 +4,8 @@ module.exports = function(f /* , streams */) {
var streams = Array.prototype.slice.call(arguments, 1);
var vals = [];
return flyd.combine(function() {
var self = arguments[arguments.length - 2];
for (var i = 0; i < streams.length; ++i) vals[i] = streams[i]();
return f.apply(null, vals);
self(f.apply(null, vals));
}, streams);
};
9 changes: 9 additions & 0 deletions module/lift/test/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -29,4 +29,13 @@ describe('lift', function() {
a(3); c(3);
assert.equal(sum(), a() + b() + c() + d() + e());
});
it('updates on undefined', function() {
var and = function(x, y) { return x && y; };
var x = stream(true);
var y = stream(true);
var s = lift(and, x, y);
assert.equal(s(), true);
x(undefined);
assert.equal(s(), undefined);
});
});