获取数组中的最后一项

#1 楼

if (loc_array[loc_array.length - 1] === 'index.html') {
   // do something
} else {
   // something else
}

#2 楼

arr.slice(-1)[0] 

arr.slice(-1).pop()

#3 楼

var lastItem = anArray.pop();

#4 楼

Array.prototype.last = function() {
    return this[this.length - 1];
}

export function last(array) {
    return array[array.length - 1];
}

#5 楼

var last = arr[arr.length - 1]

var last = arr.slice(-1)[0]

#6 楼

a = [1,2,5,6,1,874,98,"abc"];
a.length; //returns 8 elements

a.pop();  // will return "abc" AND REMOVES IT from the array 
a.length; // returns 7

a.slice(-1).pop(); // will return "abc" won't do modify the array 
                   // because slice creates a new array object 
a.length;          // returns 8; no modification and you've got you last element 

#7 楼

const foo = [1,2,3,4];
const bar = [...foo].pop();

#8 楼

while(loc_array.pop()!= "index.html"){
}
var newT = document.createTextNode(unescape(capWords(loc_array[loc_array.length])));

#9 楼

 function A(arr) {
  return arr.pop();
}

function B(arr) {  
  return arr.splice(-1,1);
}

function C(arr) {  
  return arr.reverse()[0]
}

function D(arr) {
  return arr[arr.length - 1];
}

function E(arr) {
  return arr.slice(-1)[0] ;
}

function F(arr) {
  let [last] = arr.slice(-1);
  return last;
}

function G(arr) {
  return arr.slice(-1).pop();
}

function H(arr) {
  return [...arr].pop();
}

function I(arr) {  
  return arr.reduceRight(a => a);
}

function J(arr) {  
  return arr.find((e,i,a)=> a.length==i+1);
}

function K(arr) {  
  return $(arr).get(-1);
}

function L(arr) {  
  return _.last(arr);
}

function M(arr) {  
  return _.nth(arr, -1);
}






// ----------
// TEST
// ----------

let loc_array=["domain","a","b","c","d","e","f","g","h","file"];

log = (f)=> console.log(`${f.name}: ${f([...loc_array])}`);

[A,B,C,D,E,F,G,H,I,J,K,L,M].forEach(f=> log(f)); 

 <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js" integrity="sha256-VeNaFBVDhoX3H+gJ37DpT/nTuZTdjYro9yBruHjVmoQ=" crossorigin="anonymous"></script> 

#10 楼

 const lotteryNumbers = [12, 16, 4, 33, 41, 22];
const [lastNumber] = lotteryNumbers.slice(-1);

console.log(lotteryNumbers.slice(-1));
// => [22]
console.log(lastNumber);
// => 22 

#11 楼

let [last] = arr.slice(-1);

#12 楼

var fileName = loc_array.slice(-1)[0];
if(fileName.toLowerCase() == "index.html")
{
  //your code...
}

#13 楼

let thePop = arr.pop()
thePop && arr.push(thePop)

arr.push(thePop = arr.pop())    //Unsafe if arr empty

arr[arr.length - 1]      ------> 1              -----> 1

let myPop = arr.pop()
arr.push(myPop)          ------> 2              -----> 2

arr.slice(-1).pop()      ------> 36             -----> 924  

arr.slice(-1)[0]         ------> 36             -----> 924  

[...arr].pop()           ------> 120            -----> ~21,000,000 :)

#14 楼

lastElement = document.location.href.split('/').splice(-1,1);

#15 楼

loc_array.splice(-1)[0] === 'index.html'

loc_array.slice(-1)[0] === 'index.html'

#16 楼

Object.defineProperty( Array.prototype, "getLast", {
    enumerable: false,
    configurable: false,
    writable: false,
    value: function() {
        return this[ this.length - 1 ];
    }
} );

#17 楼

[3, 2, 1, 5].reduceRight(a => a);

const last = a => a[a.length - 1];

last([3, 2, 1, 5])

[3, 2, 1, 5][[3, 2, 1, 5].length - 1]

last("1.2.3".split("."));

#18 楼

const lastElement = myArray[myArray.length - 1];

#19 楼

> $([1,2,3]).get(-1)
3
> $([]).get(-1)
undefined

#20 楼

if (_.last(loc_array) === 'index.html'){
  etc...
}

#21 楼

 const {length, [length-1]: last}=[1,2,3,4,5]
console.log(last) 

#22 楼

 var arr = [1,2,3,4,5];

console.log(arr.slice(-1)[0])
console.log(arr[arr.length-1])
const [last] = [...arr].reverse();
console.log(last)

let copyArr = [...arr];
console.log(copyArr.reverse()[0]); 

 var arr = [1,2,3,4,5];

console.log(arr.pop())
arr.push(5)
console.log(...arr.splice(-1)); 

 let arr = [1, 2, 3, 4, 5];

Object.defineProperty(arr, 'last', 
{ get: function(){
  return this[this.length-1];
 }
})

console.log(arr.last); 

#23 楼

arr.lastItem // get last item
arr.lastItem = 'value' // set last item

arr.lastIndex // get last index

#24 楼

 Array.from(myArray).pop()
 

#25 楼

var animals = ['dog', 'cat'];

animals.reverse()[0]
"cat"

animals.reverse()[0]
"dog"

animals.reverse()[1]
"dog"

animals.reverse()[1]
"cat"

#26 楼

var array = [[1,2,3], [4,5,6], [7,8,9]]
​
array.slice(-1)[0]
​
//instead of 
​
array[array.length-1]
​
//Much easier to read with nested arrays
​
array.slice(-1)[0].slice(-1)[0]
​
//instead of
​
array[array.length-1][array[array.length-1].length-1]

#27 楼

Array.prototype.last = function () {
    return this[this.length - 1];
};

#28 楼

 if(typeof Array.prototype.last === 'undefined') {
    Object.defineProperty(Array.prototype, 'last', {
        get : function() {
            return this[this.length - 1];
        }
    });
}

// Now you can access it like
[1, 2, 3].last;            // => 3
// or
var test = [50, 1000];
alert(test.last);          // Says '1000'
 

#29 楼

 const myArray = [1, 2, 3]

console.log(myArray.lastItem)
//=> 3
 

 const myArray = [1, 2, 3]

console.log(myArray.item(-1))
//=> 3
 

#30 楼

function w(anArray) {
  return {
    last() {
      return anArray [anArray.length - 1];
    };
  };
}

let last = w ([1,2,3]).last();
console.log(last) ; // -> 3