typescript – cloning object

Solving The Specific Issue You can use a type assertion to tell the compiler that you know better: Cloning Bear in mind that sometimes it is better to write your own mapping – rather than being totally dynamic. However, there are a few “cloning” tricks you can use that give you difference effects. I will … Read more

How to export JavaScript array info to csv (on client side)?

You can do this in native JavaScript. You’ll have to parse your data into correct CSV format as so (assuming you are using an array of arrays for your data as you have described in the question): or the shorter way (using arrow functions): Then you can use JavaScript’s window.open and encodeURI functions to download the CSV file like so: … Read more

How to check for an undefined or null variable in JavaScript?

You have to differentiate between cases: Variables can be undefined or undeclared. You’ll get an error if you access an undeclared variable in any context other than typeof. A variable that has been declared but not initialized is undefined. Undefined properties , like someExistingObj.someUndefProperty. An undefined property doesn’t yield an error and simply returns undefined, which, when converted to a boolean, evaluates to false. So, … Read more