swyxio

// create context with no upfront defaultValue
// without having to do undefined check all the time
function createCtx<A>() {
  const ctx = React.createContext<A | undefined>(undefined)
  function useCtx() {
    const c = React.useContext(ctx)
    if (!c) throw new Error("useCtx must be inside a Provider with a value")
    return c
  }
  return [useCtx, ctx.Provider] as const

dlfinis

The syntax of sed command replacement is:

$ sed 's/find/replace/' file

 This sed command finds the pattern and replaces with another pattern. When the replace is left empty, the pattern/element found gets deleted.

Let us consider a sample file as below:

$ cat file
    Linux