Both Object.assign and Object spread only do a shallow merge.  An example of the problem:  // No object nesting const x = { a: 1 } const y = { b: 1 } const z = { ...x, ...y } // { a: 1, b: 1 }   The output is what you'd expect. However if I try...

I was trying to understand what is the difference between spread syntax vs slice method in the following approach.  suppose I want to make an actual copy of an array, I can probably easily do it using spread syntax  var fruits = ["Banana", &#...

I was reading from here about the object spread syntax and I'm trying to use it in my project, my setup is the following:   angular 2 angular/cli 1.0.0-rc.0 ngrx/core 1.2.0 ngrx/store 2.2.1 rxjs 5.1.0 typescript 2.0.10   In my reducer.ts I have...

I am trying to create a deep copy map method for my Redux project that will work with objects rather than arrays. I read that in Redux each state should not change anything in the previous states.  export const mapCopy = (object, callback) => {...

I'm trying to convert a data structure like this:  data = {    0:{A:a},    1:{B:b},    2:{C:c},  }   into a structure like this:  [  {0:{A:a}},  {1:{B:b}},   {2:{C:c}}, ]   Using the spread operator like this: [...data] returns any empty array....

I know one has to be very careful with the function Arguments object  But are there any known downsides (optimization/performance issues) to using the spread syntax with the Arguments object? Or is this totally okay?  I want to create an array from a...

I have added a script that uses ES6 spread operator to the project that gets the params from the url. Unsure how to revert this to the normal vanilla Javascript syntax after I discovered that the project doesn't support ES6.  It's easy to tak...

I am trying to remove a property from an object using the spread operator. Traditionally I have done this:   const original_object = { prop1 : 'string1', prop2: 'string2' }; const { prop1, ...rest } = original_object;   In the above s...

I want to use spread operator. Scenario is that there are no of players (displayed as player tile on UI). Whenever I am clicking on any of player-tile, it is becoming active (getting highlighted). Condition is that at a time only one player should be...

I want to do something like this:   const translations = {     en: {         statistics_title: 'Statistics'     },     ru: {         statistics_title: '??????????'     },     uk: {         ...ru     } }   obviously it doesn't work...