Run results for: conditionally insert properties - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:87.0) Gecko/20100101 Firefox/87.0

Browser: Firefox 87

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
boring	46994048.0 Ops/sec
spread	6300799.5 Ops/sec
Object.assign	9192079.0 Ops/sec

Tests:

boring
const obj = { hello: "world" }; if (Math.random()>.5) { obj.foo = "bar"; }
AخA

const obj = {
hello: "world"
};
if (Math.random()>.5) {
obj.foo = "bar";
}

spread

const obj = {
  hello: "world",
  ...Math.random()>.5 && { foo: "bar" }
};

 
const obj = {  hello: "world",  ...Math.random()>.5 && { foo: "bar" }};

Object.assign
const obj = Object.assign({ hello: "world" }, Math.random()>.5 && { foo: "bar" });
const obj = Object.assign({
hello: "world"
}, Math.random()>.5 && {
foo: "bar"
});