javascript - Few large arrays, or one large array of few variables? -

apologies if question has been asked before i'm finding hard word question in way might have been asked before.

q: more efficient have like: mass[128] = {0.0} speed[128] = {0.0} age[128] = {0}

or: properties[128] = {mass=0.0, speed=0.0, age=0}

and why? there simple rule bear in mind, (are few larger arrays better many small etc)?

i'm writing in js using chrome. reading , writing elements often.

thanks much!

in general, answer here is: makes sense let write simplest, clearest code; , worry performance or memory issue if run one.

using array of objects named properties more efficient in terms of access time on modern javascript engine, , less efficient in terms of memory use. in both cases, difference incredibly minor , imperceptible.

if values numbers , arrays can of fixed size, might use typed arrays, since arrays (where normal arrays aren't¹ unless javascript engine can optimization). there downsides typed arrays (their being fixed size, instance), again, if , when becomes necessary...

example of array of objects named properties:

var properties = [     {mass: 0, speed: 0, age: 0},     {mass: 1, speed: 1, age: 1},     // ... ]; 

if you're using es2015 (you said you're using chrome, can), might make const:

const properties = [     {mass: 0, speed: 0, age: 0},     {mass: 1, speed: 1, age: 1},     // ... ]; 

that only makes properties constant, not contents of array points to, can still add, remove, or amend entries desired.

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¹ that's post on anemic little blog.