Math.min with map returns NaN on 0 in collection

Question

我正在编写一段代码，我需要在其中绘制出集合中的最小值和最大值。它工作正常，直到我将 0 个值引入现在 returns NaN 的集合中。如果我运行没有 0 值的函数它将按预期工作。

const minVal = Math.min(...this.wells.map(d => Number(d.valueText) || Number(d.value)));
const maxVal = Math.max(...this.wells.map(d => Number(d.valueText) || Number(d.value)));

因此，如果我们的值介于 2 - 0.00003 - 0 之间，则最小值应为 0，最大值应为 2。

现在，如果是 10 到 0.000000001，它会起作用，或者如果我们有 1 到 10000，它会起作用。

let wells = [];

wells.push({
  posCol: 0,
  posRow: 0,
  valueText: 2
});
wells.push({
  posCol: 1,
  posRow: 0,
  valueText: 4
});
wells.push({
  posCol: 2,
  posRow: 0,
  valueText: 0
});

const minVal = Math.min(...wells.map(d => Number(d.valueText) || Number(d.value)));
const maxVal = Math.max(...wells.map(d => Number(d.valueText) || Number(d.value)));

console.log(minVal);
console.log(maxVal);

下面我将添加一个可行的示例

let wells = [];

    wells.push({
      posCol: 0,
      posRow: 0,
      valueText: 2
    });
    wells.push({
      posCol: 1,
      posRow: 0,
      valueText: 4
    });
    wells.push({
      posCol: 2,
      posRow: 0,
      valueText: 1
    });

    const minVal = Math.min(...wells.map(d => Number(d.valueText) || Number(d.value)));
    const maxVal = Math.max(...wells.map(d => Number(d.valueText) || Number(d.value)));

    console.log(minVal);
    console.log(maxVal);

遇到此问题的任何人的解决方案参考@VLAZ 解释

    let wells = [];

    wells.push({
      posCol: 0,
      posRow: 0,
      valueText: 2
    });
    wells.push({
      posCol: 1,
      posRow: 0,
      valueText: 4
    });
    wells.push({
      posCol: 2,
      posRow: 0,
      valueText: 0
    });

    const minVal = Math.min(...wells.map(d => Number(d.value) || Number(d.valueText)));
    const maxVal = Math.max(...wells.map(d => Number(d.value) || Number(d.valueText)));

    console.log(minVal);
    console.log(maxVal);

问题是 0 的值被评估为 falsy，因此转向回退，在该实例中是未定义的属性，导致 NaN。解决方案是将两者调换。

Answer 1

遇到此问题的任何人的解决方案参考@VLAZ 解释

    let wells = [];

    wells.push({
      posCol: 0,
      posRow: 0,
      valueText: 2
    });
    wells.push({
      posCol: 1,
      posRow: 0,
      valueText: 4
    });
    wells.push({
      posCol: 2,
      posRow: 0,
      valueText: 0
    });

    const minVal = Math.min(...wells.map(d => Number(d.value) || Number(d.valueText)));
    const maxVal = Math.max(...wells.map(d => Number(d.value) || Number(d.valueText)));

    console.log(minVal);
    console.log(maxVal);

问题是 0 的值被评估为 falsy，因此转向回退，在该实例中是未定义的属性，导致 NaN。解决方案是将两者调换。

Math.min with map returns NaN on 0 in collection

Math.min with map returns NaN on 0 in collection

json

typescript

aurelia