Run results for: Writing to objects - Seal vs Unsealed

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0

Browser: Firefox 142

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Unsealed

20K/s

Sealed

17K/s

View exact numbers

Test name	Executions per second
✓ Unsealed	20,263 Ops/sec
Sealed	17,185 Ops/sec

HTML Preparation code:

<!--your preparation HTML code goes here-->

Script Preparation code:

function new_struct() {
   return {
		a : Math.random(),
        b : Math.random(),
        c : Math.random(),
        d : Math.random(),
   };
}

var structs1   = new Array(10000);
var structs2   = new Array(10000);

var new_values = new Array(10000)

for (let i = 0; i < 10000; i++) {
    structs1[i]   = new_struct();
    structs2[i]   = Object.seal(Object.assign(new_struct(), structs1[i]));
    new_values[i] = new_struct();
}

Tests:

Sealed
for (let i = 0; i < structs1.length; i++) { structs1[i].a = new_values[i].a; structs1[i].b = new_values[i].b; structs1[i].c = new_values[i].c; structs1[i].d = new_values[i].d; }
Unsealed
for (let i = 0; i < structs2.length; i++) { structs2[i].a = new_values[i].a; structs2[i].b = new_values[i].b; structs2[i].c = new_values[i].c; structs2[i].d = new_values[i].d; }