I am mapping through the object in order to return an array of object. However I want to modify the "model-1111" from a string to an integer. This method works with a split, however I would like to find an alternative to split, because split will return an array, which is not the best when processing a lot of data.
const data = { "model-10389": 164703, "model-10388": 164704, "model-10387": 164705 };
const output = Object.entries(data).map(([key, id]) => ({
modelId: +key.split("-").pop(),
id
}));
console.log(output);You can slice() or substring() the string from the indexOf() the '-'
const data = { "model-10389": 164703, "model-10388": 164704, "model-10387": 164705 };
const output = Object.entries(data).map(([key, id]) => ({
modelId: +key.slice(key.indexOf("-") + 1),
id
}));
console.log(output);Or using RegExp to find the trailing digits (\d+$)
const data = { "model-10389": 164703, "model-10388": 164704, "model-10387": 164705 };
const output = Object.entries(data).map(([key, id]) => ({
modelId: +key.match(/\d+$/),
id
}));
console.log(output);Or, as I believe Nina Scholz was hinting at in the comments, you could simply replace() the prefix with an empty string.
const data = { "model-10389": 164703, "model-10388": 164704, "model-10387": 164705 };
const output = Object.entries(data).map(([key, id]) => ({
modelId: +key.replace('model-', ''),
id
}));
console.log(output);You could limit the split activities by supplying the second (optional) argument.
const data = {"model-10389-extra": 164703, "model-10388": 164704, "model-10387": 164705};
const output = Object.entries(data).map(([key, id]) => ({
modelId: +key.split("-",2)[1],
id
}));
console.log(output);