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Ensure a function is only called once
When called multiple times it will return the return value from the first call.
Unlike the module once, this one isn't naughty and extending Function.prototype
.
$ npm install onetime
const onetime = require('onetime');
let i = 0;
const foo = onetime(() => ++i);
foo(); //=> 1
foo(); //=> 1
foo(); //=> 1
onetime.callCount(foo); //=> 3
const onetime = require('onetime');
const foo = onetime(() => {}, {throw: true});
foo();
foo();
//=> Error: Function `foo` can only be called once
Returns a function that only calls fn
once.
Type: Function
Function that should only be called once.
Type: object
Type: boolean
\
Default: false
Throw an error when called more than once.
Returns a number representing how many times fn
has been called.
Note: It throws an error if you pass in a function that is not wrapped by onetime
.
const onetime = require('onetime');
const foo = onetime(() => {});
foo();
foo();
foo();
console.log(onetime.callCount(foo));
//=> 3
Type: Function
Function to get call count from.
Available as part of the Tidelift Subscription.
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