That's not likely to make any serious performance difference with an ajax call. And in tight loops, I try avoid conditionals and object creation anyways, to avoid branch prediction fails (in both the engine and CPU) and costly allocation. (Most engines only do a limited form of pooling for faster GC.)
On Wed, Nov 2, 2016, 09:04 kdex <[email protected]> wrote: > I'd imagine that from an engine point of view, this means that fewer > object shapes land in memory, at least for v8. > > Reducing the number of object shapes currently boils down to using an > object literal and setting the properties to `value || null` instead of > extending the object with new properties imperatively. > > On Wednesday, November 2, 2016 12:38:05 PM CET Isiah Meadows wrote: > > What benefit would this bring over imperatively adding properties? > > > > On Wed, Nov 2, 2016, 08:18 Luke Mitchell <[email protected]> wrote: > > > > > Hi all, > > > > > > I often come across a situation where I wish to extend an object > > > (usually an argument for an API request) if a particular condition is > > > satisfied, such as the presence of a function parameter. Currently the > > > only way to do this is by assigning the object to a variable, checking > > > the condition using an `if` statement and then extending the object. I > > > am proposing the inclusion of an operator that allows a property to be > > > included, subject to a particular condition, inside the object > > > definition. > > > > > > The operator looks like this: > > > > > > ``` > > > let obj = { > > > cond ? prop: value > > > }; > > > > > > ``` > > > > > > The operator could also be used with a block statement, allowing > > > multiple properties to be included: > > > > > > ``` > > > let obj = { > > > cond ? { > > > prop1: value1, > > > prop2: value2 > > > } > > > }; > > > ``` > > > > > > I have created a draft proposal and would love to hear any thoughts > > > you have on the matter. You can find it on my GitHub, at the link > > > below. > > > > > > https://github.com/lukem512/proposal-condition-property-definitions > > > > > > Kind regards, > > > Luke > > > _______________________________________________ > > > es-discuss mailing list > > > [email protected] > > > https://mail.mozilla.org/listinfo/es-discuss > > > > > > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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