- Use array destructuring and String.prototype.toUpperCase() to capitalize the first letter of the string.
- Use Array.prototype.join('') to combine the capitalized first with the ...rest of the characters.
- Omit the lowerRest argument to keep the rest of the string intact, or set it to true to convert to lowercase.
//#Source https://bit.ly/2neWfJ2 const capitalize = ([first, ...rest], lowerRest = false) => first.toUpperCase() + (lowerRest ? rest.join('').toLowerCase() : rest.join('')); console.log(capitalize('fooBar')); console.log(capitalize('fooBar', true));
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ECMAScript 6 introduced String.prototype.includes:
const string = "foo"; const substring = "oo"; console.log(string.includes(substring));
includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found:
var string = "foo"; var substring = "oo"; console.log(string.indexOf(substring) !== -1);
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