How to use ES6 Fat Arrow to filter an array of objects

Question

I m trying to use ES6 arrow function with  filter to return adults  Jack  amp  Jill   It appears I cannot use an if statement    What do I need to know in order to do this in ES6   var family      name   Jack     age   26                   name   Jill     age   22                   name   James    age   5                    name   Jenny    age   2      let adults   family filter person   gt  if  person age  gt  18  person      throws error   8 37  SyntaxError  unknown  Unexpected token  8 37   let adults   family filter person   gt  if  person age  gt  18  person     My working ES5 example   let adults2   family filter function  person      if  person age  gt  18    return person

User · Answer

return arrayname filter  rec    gt  rec age  gt  18   Write this in the method and call it

User · Answer

You can t implicitly return with an if  you would need the braces   let adults   family filter person   gt    if  person age  gt  18  return person       It can be simplified though   let adults   family filter person   gt  person age  gt  18

User · Answer

It appears I cannot use an if statement    Arrow functions either allow to use an expression or a block as their body  Passing an expression  foo   gt  bar   is equivalent to the following block  foo   gt    return bar      However    if  person age  gt  18  person   is not an expression  if is a statement  Hence you would have to use a block  if you wanted to use if in an arrow function   foo   gt     if  person age  gt  18  return person        While that technically solves the problem  this a confusing use of  filter  because it suggests that you have to return the value that should be contained in the output array  However  the callback passed to  filter should return a Boolean  i e  true or false  indicating whether the element should be included in the new array or not   So all you need is  family filter person   gt  person age  gt  18     In ES5   family filter function  person      return person age  gt  18

User · Answer

As simple as you can use const adults   family filter    age      gt  age  gt  18      x000D   x000D  const family     name   Jack     age   26   x000D                  name   Jill     age   22   x000D                  name   James    age   5    x000D                  name   Jenny    age   2     x000D   x000D  const adults   family filter    age      gt  age  gt  18    x000D   x000D  console log adults  x000D   x000D   x000D

User · Answer

Here is my solution for those who use hook  If you are listing items in your grid and want to remove the selected item  you can use this solution   var list   data filter form   gt  form id     selectedRowDataId   setData list

[javascript] How to use ES6 Fat Arrow to .filter() an array of objects

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