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JavaScript: Check whether 1 appears in first or last position of a given array of integers

JavaScript Basic: Exercise-71 with Solution

Write a JavaScript program to check whether 1 appears in first or last position of a given array of integers. The array length must be greater or equal to 1.

Pictorial Presentation:

JavaScript: Check whether 1 appears in first or last position of a given array of integers.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JavaScript program to check whether 1 appears in first or last position of a given array of integers. The array length must be greater or equal to 1.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function first_last_1(nums)
{
  var end_pos = nums.length - 1;
  return nums[0] == 1 || nums[end_pos] == 1;
}


console.log(first_last_1([1, 3, 5]));
console.log(first_last_1([1, 3, 5, 1]));
console.log(first_last_1([2, 4, 6]));

Sample Output:

true
true
false

Flowchart:

Flowchart: JavaScript - Check whether 1 appears in first or last position of a given array of integers

ES6 Version:

function first_last_1(nums)
{
  const end_pos = nums.length - 1;
  return nums[0] == 1 || nums[end_pos] == 1;
}


console.log(first_last_1([1, 3, 5]));
console.log(first_last_1([1, 3, 5, 1]));
console.log(first_last_1([2, 4, 6]));

Live Demo:

See the Pen JavaScript - Check whether 1 appears in first or last position of a given array of integers - basic-ex-71 by w3resource (@w3resource) on CodePen.


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Next: Write a JavaScript program to check whether the first and last elements are equal of a given array of integers length 3.

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JavaScript: Tips of the Day

Checks if a string is an anagram of another string (case-insensitive, ignores spaces, punctuation and special characters)

Example:

const isAnagram = (str1, str2) => {
  const normalize = str =>
    str
      .toLowerCase()
      .replace(/[^a-z0-9]/gi, '')
      .split('')
      .sort()
      .join('');
  return normalize(str1) === normalize(str2);
};
console.log(isAnagram('iceman', 'cinema')); // true

Output:

true