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flip javascript Code Snippet in 2024

functionintermediate

Last Updated: 16 July 2024

Takes a function as an argument, then makes the first argument the last.

  • Use argument destructuring and a closure with variadic arguments.
  • Splice the first argument, using the spread operator (...), to make it the last before applying the rest.
const flip = fn => (first, ...rest) => fn(...rest, first);
let a = { name: 'John Smith' }; let b = {}; const mergeFrom = flip(Object.assign); let mergePerson = mergeFrom.bind(null, a); mergePerson(b); // == b b = {}; Object.assign(b, a); // == b

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