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pulling Evgeniy Dolzhenko's patch to add _.tap, with tests

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This commit is contained in:
Jeremy Ashkenas
2009-12-11 09:25:20 -05:00
parent c17879453a
commit d49196f2e7
3 changed files with 39 additions and 2 deletions
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16
test/objects.js
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@@ -17,7 +17,7 @@ $(document).ready(function() {
"indexOf", "inject", "intersect", "invoke", "isArguments", "isArray", "isDate", "isElement", "isEmpty", "isEqual",
"isFunction", "isNaN", "isNull", "isNumber", "isRegExp", "isString", "isUndefined", "keys", "last", "lastIndexOf", "map", "max",
"methods", "min", "noConflict", "pluck", "range", "reduce", "reduceRight", "reject", "rest", "select",
"size", "some", "sortBy", "sortedIndex", "tail", "template", "toArray", "uniq",
"size", "some", "sortBy", "sortedIndex", "tail", "tap", "template", "toArray", "uniq",
"uniqueId", "values", "without", "wrap", "zip"];
ok(_(expected).isEqual(_.methods(_)), 'provides a sorted list of functions');
var obj = {a : 'dash', b : _.map, c : (/yo/), d : _.reduce};
@@ -131,4 +131,18 @@ $(document).ready(function() {
ok(_.isUndefined(undefined), 'undefined is undefined');
});
test("objects: tap", function() {
var intercepted = null;
var interceptor = function(obj) { intercepted = obj; };
var returned = _.tap(1, interceptor);
equals(intercepted, 1, "passes tapped object to interceptor");
equals(returned, 1, "returns tapped object");
returned = _([1,2,3]).chain().
map(function(n){ return n * 2; }).
max().
tap(interceptor).
value();
ok(returned == 6 && intercepted == 6, 'can use tapped objects in a chain');
});
});