@sidx1024/object-sizeof

object-sizeof

 


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JavaScript does not provide sizeof (like in C), and programmer does not need to care about memory allocation/deallocation.

However, according to ECMAScript Language Specification, each String value is represented by 16-bit unsigned integer, Number uses the double-precision 64-bit format IEEE 754 values including the special "Not-a-Number" (NaN) values, positive infinity, and negative infinity.

Having this knowledge, the module calculates how much memory object will allocate.

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Please note, that V8 which compiles the JavaScript into native machine code, is not taken into account, as the compiled code is additionally heavily optimized.

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npm install object-sizeof

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#### ES5

``javascript
var sizeof = require('object-sizeof')

// 2B per character, 6 chars total => 12B
console.log(sizeof({abc: 'def'}))

// 8B for Number => 8B
console.log(sizeof(12345))

var param = {
'a': 1,
'b': 2,
'c': {
'd': 4
}
}
// 4 one two-bytes char strings and 3 eighth-bytes numbers => 32B
console.log(sizeof(param))
`

#### ES6

`javascript
import sizeof from 'object-sizeof'

// 2B per character, 6 chars total => 12B
console.log(sizeof({abc: 'def'}))

// 8B for Number => 8B
console.log(sizeof(12345))

const param = {
'a': 1,
'b': 2,
'c': {
'd': 4
}
}
// 4 one two-bytes char strings and 3 eighth-bytes numbers => 32B
console.log(sizeof(param))
``

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The MIT License (MIT)

Copyright (c) 2015, Andrei Karpushonak aka @miktam