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feat: add isNil for type checking #645

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merged 2 commits into from
Mar 14, 2018
Merged

feat: add isNil for type checking #645

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da46c63
feat: provide isNil(x) for checking if x is the end of stream marker
alvis Mar 1, 2018
ae3ec9c
test: add a test for isNil()
alvis Mar 13, 2018
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14 changes: 14 additions & 0 deletions lib/index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -917,6 +917,20 @@ function StreamRedirect(to) {
this.to = to;
}

/**
* Returns true if `x` is the end of stream marker.
*
* @id isNil
* @section Streams
* @name _.isNil(x)
* @param x - the object to test
* @api public
*/

_.isNil = function (x) {
return x === _.nil;
};

/**
* Returns true if `x` is a Highland Stream.
*
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13 changes: 13 additions & 0 deletions test/test.js
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Expand Up @@ -324,6 +324,19 @@ exports.seq = function (test) {
test.done();
};

exports.isNilTest = function (test) {
test.ok(_.isNil(_.nil));
test.ok(!_.isNil());
test.ok(!_.isNil(undefined));
test.ok(!_.isNil(null));
test.ok(!_.isNil(123));
test.ok(!_.isNil({}));
test.ok(!_.isNil([]));
test.ok(!_.isNil('foo'));
test.ok(!_.isNil(_()));
test.done();
};

exports.isStream = function (test) {
test.ok(!_.isStream());
test.ok(!_.isStream(undefined));
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