how to use the after function from the underscore library in javascript

The after function in underscore.js is used to debounce a function. It accepts two arguments: number of calls to wait for and the function to debounce. The debounced function will only be executed after it has been called n times.

Here's an example of how to use the after function in JavaScript:

index.tsx
const _ = require('underscore');

function saveToDatabase(data) {
  // save data to the database 
}

const saveToDatabaseAfter5Calls = _.after(5, saveToDatabase);

// calling saveToDatabaseAfter5Calls function for 5 times
saveToDatabaseAfter5Calls('Data 1');
saveToDatabaseAfter5Calls('Data 2');
saveToDatabaseAfter5Calls('Data 3');
saveToDatabaseAfter5Calls('Data 4');
saveToDatabaseAfter5Calls('Data 5');

// saveToDatabase function will be called after the 5th call to saveToDatabaseAfter5Calls

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In this example, the saveToDatabase function will only be executed after it has been called five times. The _.after function is used to return a new function that debounces the saveToDatabase function.

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related categories

javascript
underscore.js
functional programming
array
after

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