The JavaScript method, Array.map(f) is a pure function in that it takes a function as a parameter. That last point about pure functions warrants further exploration. First-order functions vs. pure ...

JavaScript’s arrays can hold heterogeneous types, change size on the fly, and readily insert or remove elements. Traditional methods like slice, splice, and push/pop do this by operating on the ...

One of the best known issues with array methods that mutate the array is when you use them in a React component. You can't mutate an array and then try to set it as a new state because the array ...

This collection could be things like strings, numbers, or even a mix of different data types. Sometimes we need to update or manipulate our arrays by adding or removing items, or combining one array ...