Array.push() 函数的替代代码

Question

I've been told not to use push in my coursework, as we are only allowed to use code we have been taught, which I find ridiculous.

I have written over 200 lines of code incorporating the push function multiple times. Is there a simple code alternative to the push function which I can implement for it?

Answer 1

If you need to push element to the next index in the array, use:

var arr = [];
arr[arr.length] = "something";
//output: arr = ["something"]

If you need to add element in specific index use:

var arr = [];
arr[3] = "something";
//output: arr = [undefined,undefined,undefined,"something"]

Answer 2

最接近的等价物

arr[arr.length] = value; 

Answer 3

Nowadays you can use array destructuring:

 let theArray = [1, 2, 3, 4, 5]; theArray = [ ...theArray, 6, ]; console.log(theArray);

If you want to push several elements, put them at the end of the array. You can even put elements at the beginning of the array:

 let theArray = [1, 2, 3, 4, 5]; theArray = [ -1, 0, ...theArray, 6, 7, 8, 9, 10 ]; console.log(theArray);

The doc about it:

MDN Destructuring Assignment