How to get the last element of array and save in variable-CodePudding

I am trying to save the last element of an array which gets its values from a multiselect dropdown and looks like this for example with two elements: [34, 33]

What I want to do know is to always get the last element inside it in this case the 33 and save it for further use in a variable. But for some reason personId2 is always all elements like this: [34, 33] But I want to have just the 34 if it is the only element or the 33 if it is the last element .

this is the part where I am trying to get the last element:

let personId = 0
    let personersonId2 = 0
    this.personArray.push(this.form.controls.multiSelectBox.value)
    this.personArrayStaging = this.personArray[length]
   
    for(personId = 0; personId < this.personArray.length - 1; personId   ){
        personId2 = this.personArray[personId ]
    }

CodePudding user response：

Can not follow the code, but if you want to grab the last element of an array all you need is calling arr[arr.length-1]. If you don't want to repeat it over and over, make it a function

lastElement = (arr) => arr[arr.length-1]


let x = lastElement([]) // x = undefined
let y = lastElement([1,2]) // y = 2 
let z = lastElement([3]) // z = 3

CodePudding user response：

In order to get the last element of the array, the simplest solution is to call arr.at(-1)

const arr = [11, 22, 33, 44];
const lastElement = arr.at(-1); // 44