JavaScript: Test whether an array of integers of length 2 does not contain 1 or a 3

Last update on May 30 2022 10:02:20 (UTC/GMT +8 hours)

JavaScript Basic: Exercise-78 with Solution

Write a JavaScript program to test whether an array of integers of length 2 does not contain 1 or a 3.

Pictorial Presentation:

JavaScript: Test whether an array of integers of length 2 does not contain 1 or a 3.

Sample Solution:

HTML Code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width">
  <title>JavaScript program to test whether an array of integers of length 2 does not contain 1 or a 3.</title>
</head>
<body>

</body>
</html>

JavaScript Code:

function is13(nums) {
  if (nums.indexOf(1) == -1 && nums.indexOf(3) == -1){
      return true;
  } else {
      return false;
  }
}

console.log(is13([7, 8]));
console.log(is13([3, 2]));
console.log(is13([0, 1]));

Sample Output:

true
false
false

Flowchart:

ES6 Version:

function is13(nums) {
  if (!nums.includes(1) && !nums.includes(3)){
      return true;
  } else {
      return false;
  }
}

console.log(is13([7, 8]));
console.log(is13([3, 2]));
console.log(is13([0, 1]));

Live Demo:

See the Pen JavaScript - Test whether an array of integers of length 2 does not contain 1 or a 3-basic-ex-78 by w3resource (@w3resource) on CodePen.

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JavaScript: Tips of the Day

How to insert an item into an array at a specific index (JavaScript)?

What you want is the splice function on the native array object.

arr.splice(index, 0, item); will insert item into arr at the specified index (deleting 0 items first, that is, it's just an insert). In this example we will create an array and add an element to it into index 2:

var arr = []; arr[0] = "Jani"; arr[1] = "Hege"; arr[2] = "Stale"; arr[3] = "Kai Jim"; arr[4] = "Borge"; console.log(arr.join()); arr.splice(2, 0, "Lene"); console.log(arr.join());

Ref: https://bit.ly/2BXbp04