catch forEach last iteration

Question

arr    1 2 3   arr forEach function i      last iteration       How to catch when the loop ending  I can do if i    3  but I might don t know what is the number of my array

User · Accepted Answer

Updated answer for ES6  is here     arr    1  2  3     arr forEach function i  idx  array      if  idx     array length - 1           console log  Last callback call at index     idx     with value     i                would output    Last callback call at index 2 with value 3   The way this works is testing arr length against the current index of the array  passed to the callback function

User · Answer

const arr   1  2  3  arr forEach function element    if arr arr length-1      element     console log  Last Element

User · Answer

The 2018 ES6  ANSWER IS       const arr    1  2  3        arr forEach  val  key  arr    gt          if  Object is arr length - 1  key                execute last item logic         console log  Last callback call at index   key  with value   val

[javascript] catch forEach last iteration

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