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Translate border-left-width to borderLeftWidth

importance: 5

Write the function camelize(str) that changes dash-separated words like “my-short-string” into camel-cased “myShortString”.

That is: removes all dashes, each word after dash becomes uppercased.

Examples:

camelize("background-color") == 'backgroundColor';
camelize("list-style-image") == 'listStyleImage';
camelize("-webkit-transition") == 'WebkitTransition';

P.S. Hint: use split to split the string into an array, transform it and join back.

Open a sandbox with tests.

function camelize(str) {
  return str
    .split('-') // splits 'my-long-word' into array ['my', 'long', 'word']
    .map(
      // capitalizes first letters of all array items except the first one
      // converts ['my', 'long', 'word'] into ['my', 'Long', 'Word']
      (word, index) => index == 0 ? word : word[0].toUpperCase() + word.slice(1)
    )
    .join(''); // joins ['my', 'Long', 'Word'] into 'myLongWord'
}

Open the solution with tests in a sandbox.

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