Cacher is the code snippet organizer for pro developers

var names = ['HTML', 'CSS', 'JavaScript'];

var nameLengths = names.map(function(name) {
  return name.length;
});

// получили массив с длинами
alert( nameLengths ); // 4,3,10
console.log(itosfen(100, 2));





var arr = ['HTML', 'CSS3', 'JavaScript', 'ReactJS' ];

var arrLen = arr.map(function(name) { 
    // ...
    return name.length; 
});

console.log(arrLen);