All files / fns index.ts

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const interleave = <T, K>(list: readonly T[], item: K): (T | K)[] =>
  list.flatMap((node) => [node, item]).slice(0, -1);
 
const pipe =
  <T>(...functions: readonly ((value: T) => T)[]) =>
  (initialValue: T): T => {
    let result = initialValue;
 
    for (const functionInPipe of functions) {
      result = functionInPipe(result);
    }
 
    return result;
  };
 
export { interleave, pipe };