JavaScript - первое слово строки

const str = "What day of the week is it?";

// 1) the match() method:
str.match(/^\w+\s/)[0];// => What

// 2) the split() method:
str.split(' ')[0];  // => What

// 3) the slice() method:
str.slice(0, str.indexOf(' ')); // => What
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