30-seconds-of-code/snippets/js/s/yes-no.md

title, type, language, tags, unlisted, cover, dateModified

title	type	language	tags	unlisted	cover	dateModified
Check yes/no string	snippet	javascript	string regexp	true	fort-lamp	2021-01-04T13:04:15+02:00

Returns true if the string is 'y'/'yes' or false if the string is 'n'/'no'.

• Use RegExp.prototype.test() to check if the string evaluates to 'y'/'yes' or 'n'/'no'.
• Omit the second argument, def to set the default answer as 'no'.

const yesNo = (val, def = false) =>
  /^(y|yes)$/i.test(val) ? true : /^(n|no)$/i.test(val) ? false : def;

yesNo('Y'); // true
yesNo('yes'); // true
yesNo('No'); // false
yesNo('Foo', true); // true