child_process: refactor self=this in socket_list #5860
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The socket list module (used by child_process) currently uses the `var self = this;` pattern for context in several places, this PR replaces this with arrow functions or passing a parameter in where appropriate. Note that the `var self = this` in the _request is intentioanlly left in place since it is not trivial to refactor it and the current pattern isn't bad given the use case. PR-URL: Reviewed-By: Reviewed-By:
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LGTM if CI is ok: https://ci.nodejs.org/job/node-test-pull-request/2039/ |
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LGTM, and CI is green. |
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LGTM, CI is green |
| this.connections--; | ||
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| if (self.connections === 0) self.emit('empty'); | ||
| if (this.connections === 0) this.emit('empty', this); |
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Where does the passed this end up here? Seems unnecessary?
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It gets passed to onempty() which is the empty event handler added on line 82.
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To send the context as a parameter seems ambigous. Since we are using arrow functions, why not just binding the method l.82 ? onempty.bind(this)
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@ludoblues bind is slow and it makes the resulting function slow too. It is also very scarcely used in Node where this pattern is very common. See http://stackoverflow.com/questions/17638305/why-is-bind-slower-than-a-closure
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Landed in a6b9b55 |
benjamingr
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Mar 27, 2016
The socket list module (used by child_process) currently uses the `var self = this;` pattern for context in several places, this PR replaces this with arrow functions or passing a parameter in where appropriate. Note that the `var self = this` in the _request is intentioanlly left in place since it is not trivial to refactor it and the current pattern isn't bad given the use case. PR-URL: #5860 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Brian White <mscdex@mscdex.net>
evanlucas
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Mar 30, 2016
The socket list module (used by child_process) currently uses the `var self = this;` pattern for context in several places, this PR replaces this with arrow functions or passing a parameter in where appropriate. Note that the `var self = this` in the _request is intentioanlly left in place since it is not trivial to refactor it and the current pattern isn't bad given the use case. PR-URL: #5860 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Brian White <mscdex@mscdex.net>
evanlucas
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Mar 31, 2016
The socket list module (used by child_process) currently uses the `var self = this;` pattern for context in several places, this PR replaces this with arrow functions or passing a parameter in where appropriate. Note that the `var self = this` in the _request is intentioanlly left in place since it is not trivial to refactor it and the current pattern isn't bad given the use case. PR-URL: #5860 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Brian White <mscdex@mscdex.net>
MylesBorins
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Apr 8, 2016
The socket list module (used by child_process) currently uses the `var self = this;` pattern for context in several places, this PR replaces this with arrow functions or passing a parameter in where appropriate. Note that the `var self = this` in the _request is intentioanlly left in place since it is not trivial to refactor it and the current pattern isn't bad given the use case. PR-URL: #5860 Reviewed-By: Colin Ihrig <cjihrig@gmail.com> Reviewed-By: James M Snell <jasnel 7DB4 l@gmail.com> Reviewed-By: Brian White <mscdex@mscdex.net>
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Pull Request check-list
Affected core subsystem(s)
child_process
Description of change
The socket list module (used by child_process) currently uses the
var self = this;pattern for context in several places, this PR replaces this with arrow functions or passing a parameter in where appropriate.Note that the
var self = thisin the _request is intentionally left in place since it is not trivial to refactor it and the current pattern isn't bad given the use case.