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JavaScript: Create a new array taking the first and last elements from a given array of integers and length must be greater or equal to 1

JavaScript Basic: Exercise-76 with Solution

Write a JavaScript program to create a new array taking the first and last elements from a given array of integers and length must be greater or equal to 1.

Pictorial Presentation:

JavaScript: Create a new array taking the first and last elements from a given array of integers and length must be greater or equal to 1.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JavaScript program to create a new array taking the first and last elements from a given array of integers and length must be greater or equal to 1.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function started(nums) {
     var array1 = [];
     array1.push(nums[0], nums[nums.length - 1]);

     return array1;
}
console.log(started([20, 20, 30]));
console.log(started([5, 2, 7, 8]));
console.log(started([17, 12, 34, 78])); 

Sample Output:

[20,30]
[5,8]
[17,78]

Flowchart:

Flowchart: JavaScript - Create a new array taking the first and last elements from a given array of integers and length must be greater or equal to 1

ES6 Version:

function started(nums) {
     const array1 = [];
     array1.push(nums[0], nums[nums.length - 1]);

     return array1;
}
console.log(started([20, 20, 30]));
console.log(started([5, 2, 7, 8]));
console.log(started([17, 12, 34, 78]));

Live Demo:

See the Pen JavaScript - Create a new array taking the middle elements of the two arrays of integer and each length 3 - basic-ex-75 by w3resource (@w3resource) on CodePen.


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JavaScript: Tips of the Day

Converts a string to title case

Example:

const toTitleCase = str =>
  str
    .match(/[A-Z]{2,}(?=[A-Z][a-z]+[0-9]*|\b)|[A-Z]?[a-z]+[0-9]*|[A-Z]|[0-9]+/g)
    .map(x => x.charAt(0).toUpperCase() + x.slice(1))
    .join(' ');
console.log(toTitleCase('some_database_field_name')); // 'Some Database Field Name'
console.log(toTitleCase('Some label that needs to be title-cased')); // 'Some Label That Needs To Be Title Cased'
console.log(toTitleCase('some-package-name')); // 'Some Package Name'
console.log(toTitleCase('some-mixed_string with spaces_underscores-and-hyphens')); // 'Some Mixed String With Spaces Underscores And Hyphens' 

Output:

"Some Database Field Name"
"Some Label That Needs To Be Title Cased"
"Some Package Name"
"Some Mixed String With Spaces Underscores And Hyphens"