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akhtarvahid
akhtarvahid
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Multiple ways to find last value of an array in javascript

  • Without affecting original array

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(arrcopyArr.reverse()[0]);

  • Modifies original array

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

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

  • By creating own helper method

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

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

console.log(arr.last);

Multiple ways to find last value of an array in javascript

  • Without affecting original array

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)
console.log(arr.reverse()[0])

  • Modifies original array

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

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

  • By creating own helper method

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

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

console.log(arr.last);

Multiple ways to find last value of an array in javascript

  • Without affecting original array

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]);

  • Modifies original array

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

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

  • By creating own helper method

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

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

console.log(arr.last);

Source Link
akhtarvahid
akhtarvahid
  • 9.8k
  • 2
  • 30
  • 33

Multiple ways to find last value of an array in javascript

  • Without affecting original array

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)
console.log(arr.reverse()[0])

  • Modifies original array

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

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

  • By creating own helper method

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

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

console.log(arr.last);