克隆数组并使其具有唯一性- Javascript [复制]

function uniqueArray(arr) {
  return [...new Set(arr)];
}

// 示例
const originalArray = [1, 2, 2, 3, 4, 4, 5];
const uniqueArray = uniqueArray(originalArray);
console.log(uniqueArray); // 输出: [1, 2, 3, 4, 5]

function uniqueArray(arr) {
  return arr.filter((item, index) => arr.indexOf(item) === index);
}

// 示例
const originalArray = [1, 2, 2, 3, 4, 4, 5];
const uniqueArray = uniqueArray(originalArray);
console.log(uniqueArray); // 输出: [1, 2, 3, 4, 5]

function uniqueArray(arr) {
  const seen = {};
  return arr.filter(item => {
    return seen.hasOwnProperty(item) ? false : (seen[item] = true);
  });
}

// 示例
const originalArray = [1, 2, 2, 3, 4, 4, 5];
const uniqueArray = uniqueArray(originalArray);
console.log(uniqueArray); // 输出: [1, 2, 3, 4, 5]

function uniqueArray(arr, compareFn) {
  const seen = new Map();
  return arr.filter(item => {
    const key = compareFn ? compareFn(item) : JSON.stringify(item);
    return !seen.has(key) ? (seen.set(key, true), true) : false;
  });
}

// 示例
const originalArray = [{id: 1, name: 'Alice'}, {id: 2, name: 'Bob'}, {id: 1, name: 'Alice'}];
const uniqueArray = uniqueArray(originalArray, item => item.id);
console.log(uniqueArray); // 输出: [{id: 1, name: 'Alice'}, {id: 2, name: 'Bob'}]