javascript - 查找对象中最接近的整数

Question

正如标题所说，我正在尝试查找对象中最接近的整数，我的数据按以下方式存储，我无法更改其存储方式。

{"response":
    {"success":1,"current_time":1490650140,"items":
        {"AK-47 | Aquamarine Revenge (Battle-Scarred)":{"last_updated":1490648718,"quantity":98,"value":1120},
        "AK-47 | Aquamarine Revenge (Factory New)":{"last_updated":1490648718,"quantity":47,"value":3229},
        "AK-47 | Aquamarine Revenge (Field-Tested)":{"last_updated":1490648718,"quantity":159,"value":1623}
        }
    }
}

我想找到最接近给定数字 (x) 的项目。如果元素值(value)相同，则应该选择其中之一。我知道我需要一个循环，但我不知道从哪里开始。

我正在尝试找到与 obj 中的值最接近的整数 x。

Answer 1

您可以在对象上使用 for..in ，或使用数组迭代方法 for、.forEach 等，方法是Object.keys(data.response.items)(这将为您提供一个对象键数组)。

const data = {"response":
    {"success":1,"current_time":1490650140,"items":
        {"AK-47 | Aquamarine Revenge (Battle-Scarred)":{"last_updated":1490648718,"quantity":98,"value":1120},
        "AK-47 | Aquamarine Revenge (Factory New)":{"last_updated":1490648718,"quantity":47,"value":3229},
        "AK-47 | Aquamarine Revenge (Field-Tested)":{"last_updated":1490648718,"quantity":159,"value":1623}
        }
    }
};
const target = 1344;

function findClosestForIn(items, target) {
    let closestVal = Infinity;
    let closestObj = null;

    for (let key in items) {
        let obj = items[key];
        let curDiff = Math.abs(obj.value - target);

        if (curDiff < closestVal) {
          closestVal = curDiff;
          closestObj = obj;
        }
    }

    return closestObj;
}

function findClosestObjectKeys(items, target) {
    let closestVal = Infinity;
    let closestObj = null;

    Object.keys(data.response.items).forEach((key) => {
        const obj = data.response.items[key];
        const curDiff = Math.abs(obj.value - target);

        if (curDiff < closestVal) {
          closestVal = curDiff;
          closestObj = obj;
        }
    });

    return closestObj;
}


console.log('closest using for..in: ', findClosestForIn(data.response.items, target));
console.log('closest using Object.keys: ', findClosestObjectKeys(data.response.items, target));