@sidx1024/object-sizeof
v1.6.4
Published
Sizeof of a JavaScript object in Bytes
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object-sizeof
Get size of a JavaScript object in Bytes
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.
Limitations
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.
Installation
npm install object-sizeof
Examples
ES5
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
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))
Licence
The MIT License (MIT)
Copyright (c) 2015, Andrei Karpushonak aka @miktam