将数字字符串替换为数组中的数字

Question

我想从

转换一个数组

arr = ["step","0","instruction","1"]

至

newArr = ["step",0,"instruction",1]

这是我的示例代码：

  newArr = arr.map((x) => {
      if (typeof x === "number") {
        return x;
      }
    });

Answer 1

在这种情况下，您可以检查字符串是否可转换为有限数字并映射数字。

const
    data = ["step", "0", "instruction", "1"],
    result = data.map(v => isFinite(v) ? +v : v);

console.log(result);

如果您还需要所有其他数字，您可以转换为数字并检查字符串是否与值相符。

const
    data = ["step", "0", "instruction", "1", "NaN", "Infinity"],
    result = data.map(v => v === (+v).toString() ? +v : v);

console.log(result);

Answer 2

我想你正在寻找这样的东西：

// Defining initial values
const initialValues = ["step","0","instruction","1"]

// Mapping initial values to a new parsed array
const parsedValues = initialValues.map(value => {
  // We try to parse the value. If it isNaN (Not a number) we just return the value e.g. don't change it
  if(isNaN(parseInt(value))) return value;
  // Else the value can be parsed to a number, so we return the parsed version.
  return parseInt(value);
})
// Printing the parsed results
console.log(parsedValues);

Answer 3

试试这个：

const arr = ["step","0","instruction","1"]

const newArray = arr.map(value => { //Iterate the array searching for possible numbers.
/* Check with function isNaN if the value is a number, 
  if true just return the value converted to number, 
  otherwise just return the value without modification */
  if (!Number.isNaN(Number(value))) { 
      return Number(value)
  }

  return value
})

将数字字符串替换为数组中的数字

replace numeric string to number inside an array

javascript

arrays

replace

reactjs