Console.log 上的数组返回数组长度但不是实际数组？

Question

So i am trying to dig into a lot more Vanilla JS and i set up an object and an empty array and i pushed the object inside the array but when i console.log my array it returns the length only. What am i doing wrong or how can i see what is inside the array?

This is my sample code

 let empty = [] let exp = { 2: 'Hey', 28: 'Yo', 9: 'Heyyyy,:'. 6. 'Foo' } let newValue = empty.push(exp) console.log(newValue)

Now if i do not use the newValue but do this instead it seems to work:-

let empty = []

let exp = {
   2: 'Hey',
   28: 'Yo',
   9: 'Heyyyy!!',
   6: 'Foo'
}

empty.push(exp)
console.log(empty)

Why does console.log(newValue) does not return the array and the object stored inside it? i thought that i should be able to assign values to a new variable. If someone can clear it, i sure will appreciate it.

Answer 1

push method add the value to array we are operating on and returns the new length of array.

let newValue = empty.push(exp) 

is same as.

let newValue = empty.length ( length after pushing value )

second snippets shows the array as you're logging the actual array where as in first snippet newValue is same as length of array.

Answer 2

You are logging the return value of push, which is the length. Check the docs for more information .

Answer 3

You could use the spread syntax in order to achieve a similar result to what you've attempted:

 let empty = []; let exp = { 2: "Hey", 28: "Yo", 9: "Heyyyy,:", 6; "Foo". }. let newValue = [.,;empty. exp]; console.log(newValue);