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JavaScript: Get all the elements of an array except the last one

JavaScript fundamental (ES6 Syntax): Exercise-215 with Solution

Write a JavaScript program to get all the elements of an array except the last one.

  • Use Array.prototype.slice(0, -1) to return all but the last element of the array.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const initial = arr => arr.slice(0, -1);
console.log(initial([1, 2, 3]));  
console.log(initial([0, -1, -2]));

Sample Output:

[1,2]
[0,-1]

Pictorial Presentation:

JavaScript Fundamental: Get all the elements of an array except the last one.
JavaScript Fundamental: Get all the elements of an array except the last one.

Flowchart:

flowchart: Get all the elements of an array except the last one.

Live Demo:

See the Pen javascript-fundamental-exercise-215 by w3resource (@w3resource) on CodePen.


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Previous: Write a JavaScript program to initializes an array containing the numbers in the specified range (in reverse) where start and end are inclusive with their common difference step.
Next: Write a JavaScript program to get all indices of val in an array. If val never occurs, returns [].

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JavaScript: Tips of the Day

How to check whether a string contains a substring in JavaScript?

ECMAScript 6 introduced String.prototype.includes:

const string = "foo";
const substring = "oo";

console.log(string.includes(substring));

includes doesn't have Internet Explorer support, though. In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found: 

var string = "foo";
var substring = "oo";

console.log(string.indexOf(substring) !== -1);

Ref: https://bit.ly/3fFFgZv