Run results for: forEach vs map by cuteLuna v2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
map	1725395.5 Ops/sec
forEach	1679411.2 Ops/sec
for loop	1737686.5 Ops/sec

Tests:

map

const cuteObject = {
  [1]: [ { name: 'luna', id: 135 } ],
  [3]: [ { name: 'fat', id: 136 } ]
};

const newList = Object.keys(cuteObject).map(key => {
    const options = cuteObject[key].map(item => ({
      label: item.name,
      name: item.name,
      id: item.id,
    }));

    return {
      label: key,
      options: options,
    };
  });

​x
 
const cuteObject = {  [1]: [ { name: 'luna', id: 135 } ],  [3]: [ { name: 'fat', id: 136 } ]};​const newList = Object.keys(cuteObject).map(key => {    const options = cuteObject[key].map(item => ({      label: item.name,      name: item.name,      id: item.id,    }));​    return {      label: key,      options: options,    };  });

forEach

const cuteObject = {
  [1]: [ { name: 'luna', id: 135 } ],
  [3]: [ { name: 'fat', id: 136 } ]
};

const newList = [];
Object.keys(cuteObject).forEach(key => {
    const options = [];
    cuteObject[key].forEach(item => {
        options.push({
            label: item.name,
            name: item.name,
            id: item.id,
        });
    });

    newList.push({
        label: key,
        options: options,
    });
});

 
const cuteObject = {  [1]: [ { name: 'luna', id: 135 } ],  [3]: [ { name: 'fat', id: 136 } ]};​const newList = [];Object.keys(cuteObject).forEach(key => {    const options = [];    cuteObject[key].forEach(item => {        options.push({            label: item.name,            name: item.name,            id: item.id,        });    });​    newList.push({        label: key,        options: options,    });});​

for loop

const cuteObject = {
  [1]: [ { name: 'luna', id: 135 } ],
  [3]: [ { name: 'fat', id: 136 } ]
};

const newList = [];
const keys = Object.keys(cuteObject);
const keysLength = keys.length;

for (let i = 0; i < keysLength; i++) {
    const key = keys[i];
    const options = [];
    const items = cuteObject[key];
    const itemsLength = items.length;

    for (let j = 0; j < itemsLength; j++) {
        const item = items[j];
        options.push({
            label: item.name,
            name: item.name,
            id: item.id,
        });
    }

    newList.push({
        label: key,
        options: options,
    });
}

 
const cuteObject = {  [1]: [ { name: 'luna', id: 135 } ],  [3]: [ { name: 'fat', id: 136 } ]};​const newList = [];const keys = Object.keys(cuteObject);const keysLength = keys.length;​for (let i = 0; i < keysLength; i++) {    const key = keys[i];    const options = [];    const items = cuteObject[key];    const itemsLength = items.length;​    for (let j = 0; j < itemsLength; j++) {        const item = items[j];        options.push({            label: item.name,            name: item.name,            id: item.id,        });    }​    newList.push({        label: key,        options: options,    });}​