JS: Set.prototype.has
(new in JS: ECMAScript 2015)
mySet.has(value)-
Return
trueif value is in set. Else,false.const xx = new Set([3, 4, 5]); // check existence console.log(xx.has(5) === true); console.log(xx.has(99) === false);
(new in JS: ECMAScript 2015)
mySet.has(value)Return true if value is in set. Else, false.
const xx = new Set([3, 4, 5]); // check existence console.log(xx.has(5) === true); console.log(xx.has(99) === false);