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once()

once<T>(fn): (...args) => void

Ensures that the given function is only called once.

Type Parameters​

• T extends SomeFunction

Parameters​

fn​

T

The function to call once.

Returns​

Function

Parameters​

args​

...Parameters<T>

Returns​

void

Example​

let globalVal = 10;
const addGlobal = (n: number) => {
  globalVal = globalVal + n;
}
const onceAdd = once(addGlobal);

onceAdd(5); // 15
onceAdd(5); // 15