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JavaScript: Find all elements in a given array except for the first one

JavaScript fundamental (ES6 Syntax): Exercise-31 with Solution

Write a JavaScript program to find all elements in a given array except for the first one. Return the whole array if the array's length is 1.

  • Return Array.prototype.slice(1) if Array.prototype.length is more than 1, otherwise, return the whole array.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const tail = arr => (arr.length > 1 ? arr.slice(1) : arr);
console.log(tail([1, 2, 3])); 
console.log(tail([1]));

Sample Output:

[2,3]
[1]

Pictorial Presentation:

JavaScript Fundamental: Find all elements in a given array except for the first one

Flowchart:

flowchart: Find all elements in a given array except for the first one

Live Demo:

See the Pen javascript-basic-exercise-1-31 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript program to filter out the element(s) of a given array, that have one of the specified values.
Next: Write a JavaScript program to get the sum of a given array, after mapping each element to a value using the provided function.

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JavaScript: Tips of the Day

How to remove a specific item from an array?

Find the index of the array element you want to remove using indexOf, and then remove that index with splice.

The splice() method changes the contents of an array by removing existing elements and/or adding new elements.

const array = [2, 5, 9];

console.log(array);

const index = array.indexOf(5);
if (index > -1) {
  array.splice(index, 1);
}

// array = [2, 9]
console.log(array);

The second parameter of splice is the number of elements to remove. Note that splice modifies the array in place and returns a new array containing the elements that have been removed.

For the reason of completeness, here are functions. The first function removes only a single occurrence (i.e. removing the first match of 5 from [2,5,9,1,5,8,5]), while the second function removes all occurrences:

function removeItemOnce(arr, value) {
  var index = arr.indexOf(value);
  if (index > -1) {
    arr.splice(index, 1);
  }
  return arr;
}

function removeItemAll(arr, value) {
  var i = 0;
  while (i < arr.length) {
    if (arr[i] === value) {
      arr.splice(i, 1);
    } else {
      ++i;
    }
  }
  return arr;
}
//Usage
console.log(removeItemOnce([2,5,9,1,5,8,5], 5))
console.log(removeItemAll([2,5,9,1,5,8,5], 5))

Ref: https://bit.ly/2N9nKRp