javascript - How to use the _.once() function in lodash? - Stack Overflow

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I am have tried to use the once function in lodash as follows:

_.once(pageTwoSegmentEvent);

_.once(() => {
  pageTwoSegmentEvent();
})

I have also tried importing only the once function from lodash and not the _

once(pageTwoSegmentEvent);

once(() => {
  pageTwoSegmentEvent();
});

But the function pageTwoSegmentEvent never actually gets called. However, if I remove the once function that its wrapped in and just call it like normal then it works but gets called too many times. Does anyone know how to get the once function from lodash to work?

I am have tried to use the once function in lodash as follows:

_.once(pageTwoSegmentEvent);

_.once(() => {
  pageTwoSegmentEvent();
})

I have also tried importing only the once function from lodash and not the _

once(pageTwoSegmentEvent);

once(() => {
  pageTwoSegmentEvent();
});

But the function pageTwoSegmentEvent never actually gets called. However, if I remove the once function that its wrapped in and just call it like normal then it works but gets called too many times. Does anyone know how to get the once function from lodash to work?

• javascript
• lodash

Share Improve this question Follow asked Jun 6, 2019 at 18:42 FairyQueenFairyQueen 2,37388 gold badges3838 silver badges5858 bronze badges

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2 Answers 2

Sorted by: Reset to default 6

You don't use _.once like that. You use the new function that _.once returns.

function foo() {
  console.log("foo");
}

const oncedFoo = _.once(foo);

oncedFoo();
oncedFoo();
oncedFoo();

<script src="https://cdnjs.cloudflare./ajax/libs/lodash.js/4.17.11/lodash.core.min.js"></script>

_.once returns a function, so you have to call the returned function

Try doing

_.once(pageTwoSegmentEvent)();

(note the parenthesis at the end)

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