Simply You can do this,
let str = ' aaa aa ';
str = str.replace(/\s\s+/g,'');
console.log(str);
Simply You can do this,
let str = ' aaa aa ';
str = str.replace(/\s/g,'');
console.log(str);
Simply You can do this,
let str = ' aaa aa ';
str = str.replace(/\s+/g,'');
console.log(str);