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 am confused about the spread syntax and rest parameter in ES2015. Can anybody explain the difference between them with proper examples?...

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", &#...

New to React.js, I am having hard time using the spread operator in my reducers to update my state that has an 2D-array property.  For instance initial state is so:  let initialState = {     grid: new Array(5).fill(new Array(5).fill(0)),     player:...

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 attempting to import everything from a library as a hash, modify it, and re-export the modified hash, without knowing all of the named exports in a library. For example:  import * as reactBootstrap from 'react-bootstrap';  wrappedReactBo...

Why can't spread operator be used multiple times?  let arr = [[[1, 2, 3]]];  console.log(arr); // Array [ Array[1] ] console.log(...arr); // Array [ Array[3] ] console.log(...(...arr)); // SyntaxError: expected '=>' after argument list...

How can I spread an objects/dict(?) properties and into a new object/dict?  Simple Javascript:  const obj = {x: '2', y: '1'} const thing = {...obj, x: '1'} // thing = {x: '1', y: 1}   Python:  regions = [] for doc in l...

Whenever you want to use a computed getter with the mapGetter helper from Vuex you would use it like so:  ...mapGetters([     'getter1',      'getter2',      'etc' ])   I have seen the spread operator used before to expand arr...

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) => {...