使用 array.splice() 时如何编写添加元素的实例？

Question

I'm trying to create an instance of the elements that have been added using the splice() function.

var myFish = ['angels', 'clowns', 'starfish', 'sharks'];
var removed = myFish.splice(2,1, "spongebob"); 
console.log(removed); // 

The output I'm looking for is spongebob but instead I get starfish .

Any thoughts?

Answer 1

Array.splice returns the deleted elements, not the mutated array.

 var myFish = ['angels', 'clowns', 'starfish', 'sharks']; console.log("Array before we splice: ", myFish); var removed = myFish.splice(2,1, "spongebob"); console.log("Array after we splice: ", myFish); console.log("Replaced Element ", removed, "with: ", myFish[2]);

Answer 2

You are splicing by index 2 (starfish), remove 1 element and replace with 'spongebob'. starfish is removed and stored in removed var.

 var myFish = ['angels', 'clowns', 'starfish', 'sharks']; var removed = myFish.splice(2, 1, "spongebob"); console.log(myFish); //["angels", "clowns", "spongebob", "sharks"] console.log(myFish[2]); // spongebob console.log(removed); // ["starfish"]