String.prototype.split('')
and Array.prototype.map()
to call the provided function, fn
, for each character in str
.Array.prototype.join('')
to recombine the array of characters into a string.fn
, takes three arguments (the current character, the index of the current character and the string mapString
was called upon).const mapString = (str, fn) => str .split('') .map((c, i) => fn(c, i, str)) .join('');
mapString('lorem ipsum', c => c.toUpperCase()); // 'LOREM IPSUM'
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