How to define optional parameters to a function?
How to define optional parameters to a function?
functio myFunction(row = 1, data = []){
// ... function body
}
Check the existence of a key in JavaScript Object
How to check the existence of a key in JavaScript Object const myObj = { a: 1, b: 2}; We need to check whether I’d exist in object or not! const result = myObj.hasOwnProperty('id'); // false Or const result = 'id' in myObj; // false Or const result = myObj.id !== undefined; // false
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