Post-increment of array value in JavaScript-CodePudding

I learned what the different between post-increment and pre-increment was, but still surprised by the below code:

let array = [1];
array = [array[0]  ];
console.log(array);

I expected array[0] would be returned on the right hand first, then array would be assigned as [1]. After that, array[0] would be executed, and array should be [2].

Thanks for any explanation.

CodePudding user response：

let array = [1]; 

let item = array[0]  ; // item = 1

array = [item]; // array = [1]

CodePudding user response：

As we see in C

int  x= 2;
cout<< x   ;

Just like in C , the control first sets/prints the value and then increment it. It is the same case here.

let array = [1];
array = [array[0]  ];
console.log(array);

However, You can use the following below code to see difference

let array = [1];      //array[0]=1
array = [  array[0]]; //array[0]=2
console.log(array);