A question that has happened to me is that different Data type in javascript how many use of memory . for Example in C++ data type like int , char , float uses order 2 , 1 , 8 byte of memory . now data Type like Number , string , boolean , null , undefind and Objects , Arrays in javascript how many use of memory and what is ranges that accepted ? Accept my apologize because of my low English level!!!
Numbers are 8 bytes.
Found that in this w3schools page.
I searched around a bit more for other JavaScript primitive types, but it's surprisingly hard to find this information! I did find the following code though:
...
if ( typeof value === 'boolean' ) {
bytes += 4;
}
else if ( typeof value === 'string' ) {
bytes += value.length * 2;
}
else if ( typeof value === 'number' ) {
bytes += 8;
}
...
Seems to indicate that a String is 2 bytes per character, and a boolean is 4 bytes.
Found that code here and here. The full code's actually used to get the rough size of an object.
Although, upon further reading, I found this interesting code by konijn on this page: Count byte length of string.
function getByteCount( s )
{
var count = 0, stringLength = s.length, i;
s = String( s || "" );
for( i = 0 ; i < stringLength ; i++ )
{
var partCount = encodeURI( s[i] ).split("%").length;
count += partCount == 1 ? 1 : partCount-1;
}
return count;
}
getByteCount("i♥js"); // 6 bytes
getByteCount("abcd"); // 4 bytes
So it seems that the string's size in memory depends on the characters themselves. Although I am still trying to figure out why he set the count to 1 if it's 1, otherwise he took count-1 (in the for loop).
Will update post if I find anything else.