Blog 204
1 min readFeb 11, 2021
- Describe one thing you’re learning in class today. Today I learned about higher-order functions and how to use them to find different things in an array.
- Can you describe the main difference between a forEach loop and a .map() loop and why you would pick one versus the other? The forEach method is used to preform logic on every array element while the .map() method is used to create a new array that is, in some way, a transformation of an existing array. The forEach method will never be assigned to a new variable because it will return undefined. The .map() method can create a new variable that will be used when returned with each element in an array.
- Describe event bubbling. When one element is nested inside another element and both elements have registered a listener for the same event.
- What is the definition of a higher-order function? Is a function that can take another function as an argument, or that returns a function as a result.
- ES6 Template Literals offer a lot of flexibility in generating strings. Can you give an example? It makes it easier to change a variable in a string aswell as navigate through the strings.
- What Is an associative array in JavaScript? Objects where indexes are replaced by user defined keys.
- Why should you never use new Array in JavaScript? A new array has more code to transfer over and more to parse when using the terminal.
