# JavaScript: Test whether an array of integers of length 2 contains 1 or a 3

## JavaScript Basic: Exercise-77 with Solution

Write a JavaScript program to test whether an array of integers of length 2 contains 1 or a 3.

Pictorial Presentation:

Sample Solution:

HTML Code:

``````<!DOCTYPE html>
<html>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>JavaScript program to test whether an array of integers of length 2 contains 1 or a 3.</title>
<body>

</body>
</html>
```
```

JavaScript Code:

``````function contains13(nums) {

if (nums.indexOf(1) != -1 || nums.indexOf(3) != -1){
return true
}
else
{
return false
}
}

console.log(contains13([1, 5]));
console.log(contains13([2, 3]));
console.log(contains13([7, 5]));
```
```

Sample Output:

```true
true
false
```

Flowchart:

ES6 Version:

``````function contains13(nums) {

if (nums.includes(1) || nums.includes(3)){
return true
}
else
{
return false
}
}

console.log(contains13([1, 5]));
console.log(contains13([2, 3]));
console.log(contains13([7, 5]));
``````

Live Demo:

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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"
```