JavaScript: Set.prototype.has
New in JS2015.
set_obj.has(value)-
Return
trueif value is in set. Else,false.
const s = new Set([3,4,5]); // check existence console.log( s.has (5) ); // true console.log( s.has (99) ); // false
New in JS2015.
set_obj.has(value)true if value is in set. Else, false.
const s = new Set([3,4,5]); // check existence console.log( s.has (5) ); // true console.log( s.has (99) ); // false