How to add items to array in nodejs

Question

How do I iterate through an existing array and add the items to a new array    var array       forEach  calendars  function  item  index        array     item id    done     function done       console log array       The above code would normally work in JS  not sure about the alternative in node js  I tried  push and  splice but neither worked

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var array          length array now   0 array array length     hello     length array now   1               0   array     hello     length   1

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Check out Javascript s Array API for details on the exact syntax for Array methods  Modifying your code to use the correct syntax would be   var array       calendars forEach function item        array push item id        console log array     You can also use the map   method to generate an Array filled with the results of calling the specified function on each element   Something like   var array   calendars map function item        return item id       console log array     And  since ECMAScript 2015 has been released  you may start seeing examples using let or const instead of var and the   gt  syntax for creating functions   The following is equivalent to the previous example  except it may not be supported in older node versions    let array   calendars map item   gt  item id   console log array

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Here is example which can give you some hints to iterate through existing array and add items to new array  I use UnderscoreJS Module to use as my utility file   You can download from  https   npmjs org package underscore     npm install underscore   Here is small snippet to demonstrate how you can do it   var     require  underscore    var calendars    1   String       1 1  true       newArray          each calendars  function  item  index        newArray push item        console log newArray

[javascript] How to add items to array in nodejs

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