Using promises to catch errors

javascript,es6,object,web_development

return functionA()
  .then(functionB)
  .then(functionC)
  .then(functionD)
  .catch((err) => logger.error(err))
  .then(alwaysExecuteThisFunction)

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void 0 js

The void operator evaluates the given expression and then returns undefined.

serialize Form

Sử dụng formdata constructor để convert form, FormData, array.from(). Kết hợp window.encodeURIComponent() để encode từng value trong form.

Spread Operator for Objects

Using the spread operator during an Object declaration will assign the properties of the referenced Object to the new Object.

Rest Operator for Objects

Now we can use rest on the properties of an Object. It allows us to explicitly extract certain named variables, and assign any uncalled variables into a catchall Object.

group by property javascript use reduce

group by property javascript use reduce