JavaScript string type is immutable, but does it mean identical strings will share memory?
Say two strings are created in complete different places, will a modern JavaScript engine be smart enough to not double the amount of memory for each "copy" and just re-use the one already created (that exists somewhere in memory)?
Say we got:
var foo = sha256(fooInput);
// ... somewhere else
var bar = sha256(barInput);
// Say foo and bar is identical: "foo === bar" => true
// Would they share memory?
Does it make any difference if the string value is a key in objects? Example:
var cars = {
"john": {
// information about all cars "john" owns.
}
};
var computers = {
"john": {
// information about all computers "john" owns.
}
};
var phones = {
"john": {
// information about all phones "john" owns.
}
};
Will the string "john" in the example above take up memory of three or one string of "john"?
