Answers for "check if a string is empty or contains whitespaces only in js"

javascript check if blank space

function isEmptyOrSpaces(str){
    return str === null || str.match(/^ *$/) !== null;
}

regex for check if string is only empty or whitespace javascript

//empty string or white space
function hasWhiteSpace(value) {
  return /^\s*$/.test(value);
}

// empty string or string with white space 
function hasWhiteSpace(value) {
  return /^$|\s+/.test(value);
 }