GitHub 6248★

Delay the evaluation of a function

JavaScript version

// returns a new version of `fn` that returns values as lazy evaluable
const thunkfy =
(fn) =>
(...args) =>
() =>
fn(...args);

Examples

const heavyComputation = (x) => doStuff(x);
const unnecessarySlow = manyThings.map(heavyComputation).find((result) => result.criteria);
const probablyFaster = manyThings.map(thunkfy(heavyComputation)).find((thunk) => thunk().criteria);
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