从另一个数组创建一个特定元素的数组？

Question

I have an array that can't be changed in terms of the element positions:

var array = ['item1', 'section1', 'section2', 'section3', 'section4', 'section5', 'prod1', 'prod2']

I want to make a new array from 'array' that takes the elements from position 1 - 5 (so all the section elements). It needs to be by position as the section elements make change by name.

Answer 1

var array2=array.slice(1,6)

See here for more information.

Answer 2

let's say we have an array like this

 const FILES_WITH_10_ASSETS = [
  '../assets/uploads/Desktop-300x600.jpeg',
  '../assets/uploads/Desktop-728x90.png',
  '../assets/uploads/Mobile-160x600.jpeg',
  '../assets/uploads/Mobile-300X50.jpeg',
  '../assets/uploads/Mobile-320x50.jpeg',
  '../assets/uploads/Mobile-320x480.jpeg',
  '../assets/uploads/Mobile-1024x768.jpeg',
  '../assets/uploads/Tablet-300x250.jpeg',
  '../assets/uploads/Tablet-Interstitial-320x480.gif',
  '../assets/uploads/Tablet-Interstitial-320x480.jpeg'
];

now we want some specific items from an array, we will create a function for this, here I have stored the function in an constant for further use

const SELECT_ASSETS = function(assetName: string) {
  let filtered_assets: string[] = [];
  for (let i in FILES_WITH_10_ASSETS) {
    if (FILES_WITH_10_ASSETS[i].includes(assetName) === true) {
      filtered_assets.push(FILES_WITH_10_ASSETS[i]);
    }
  }
  return filtered_assets;
};

and we call the method like this in our file

const ASSETS_NAME = SELECT_ASSETS(ASSET_NAME);

now we can pass the assets name to any function or method, if we pass the ASSET_NAME as Tablet we will get all three tablet paths, or if we change it to Mobile, we will get all five Mobile paths