JavaScript Check If String

To check if a variable is a string in JavaScript, you can use the typeof operator. This operator returns the data type of the operand, which you can then compare to the string "string".

Here is an example:

function isString(val) {
  return typeof val === "string";
}
Code language: JavaScript (javascript)

In this example, the isString() function takes in a single argument val and uses the typeof operator to check if its data type is a string. If it is, the function returns true, otherwise it returns false.

You can use this function to check if a variable is a string like this:

let str = "hello";
if (isString(str)) {
  // str is a string
  console.log(str);
}
Code language: JavaScript (javascript)

In this example, the isString() function is called with the str variable as an argument. Since str is a string, the function returns true and the code inside the if block is executed.