Check if all elements in array are strings

You could do something like this - iterate through the array and test if everything is a string or not.

function check(arr) {
 for(var i=0; i<arr.length; i++){
   if(typeof arr[i] != "string") {
      return false;
    }
 }

 return true;
}

You can use Array.every to check if all elements are strings.

const isStringsArray = arr => arr.every(i => typeof i === "string")

console.log( 
  isStringsArray(['a','b','c']),
  isStringsArray(['a','','c']),
  isStringsArray(['a', ,'c']),
  isStringsArray(['a', undefined,'c']),
  isStringsArray(['a','b',1]) 
)

Tags:

Javascript

Arrays

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