Common ways to use js to determine whether data is an array or string

There are many ways to determine whether the data is an array or a string. Here are some common methods:

1. Use the typeof operator to determine the data type. If it is "string", the data is a string; if it is "object", it needs to further determine whether it is an array.

function isStringOrArray(data) {
  if (typeof data === "string") {
    ("Data is a string");
  } else if (typeof data === "object") {
    if ((data)) {
      ("Data as an array");
    }
  }
}

2. Use the instanceof operator to determine the data type. If it is String, the data is a string; if it is Array, the data is an array.

function isStringOrArray(data) {
  if (data instanceof String) {
    ("Data is a string");
  } else if (data instanceof Array) {
    ("Data as an array");
  }
}

3. Use the () method to determine whether the data is an array.

 
function isStringOrArray(data) {
  if ((data)) {
    ("Data as an array");
  } else {
    ("Data is a string");
  }
}

4. Use regular expressions to determine whether the data is a string.

 
function isStringOrArray(data) {
  if (/^[a-zA-Z]+$/.test(data)) {
    ("Data is a string");
  } else {
    ("Data as an array");
  }
}

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