javascript if array key exists
var person={"name":"Billy","age":20}
person.hasOwnProperty("name"); // true
person.hasOwnProperty("sex"); // falsejavascript if array key exists
var person={"name":"Billy","age":20}
person.hasOwnProperty("name"); // true
person.hasOwnProperty("sex"); // falsejs check if map contains key
const map1 = new Map();
map1.set('bar', 'foo');
console.log(map1.has('bar'));
// expected output: true
console.log(map1.has('baz'));
// expected output: falseCopyright © 2021 Codeinu
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