# JavaScript: Test whether a given array of integers contains 30 or 40 twice

## JavaScript Basic: Exercise-79 with Solution

Write a JavaScript program to test whether a given array of integers contains 30 or 40 twice. The array length should be 0, 1, or 2.

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 a given array of integers contains 30 or 40 twice. The array length should be 0, 1, or 2.</title>
<body>

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

JavaScript Code:

``````function twice3040(arra1) {
let a = arra1,
b = arra1;
return (a === 30 && b === 30) || (a === 40 && b === 40);
}

console.log(twice3040([30, 30]));
console.log(twice3040([40, 40]));
console.log(twice3040([20, 20]));
console.log(twice3040());
```
```

Sample Output:

```true
true
false
true
```

Flowchart: ES6 Version:

``````function twice3040(arra1) {
let a = arra1;
let b = arra1;
return (a === 30 && b === 30) || (a === 40 && b === 40);
}

console.log(twice3040([30, 30]));
console.log(twice3040([40, 40]));
console.log(twice3040([20, 20]));
console.log(twice3040());
``````

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

Assigns default values for all properties in an object that are undefined

Example:

```const tips_defaults = (obj, ...defs) => Object.assign({}, obj, ...defs.reverse(), obj);
console.log(tips_defaults({ p: 1 }, { q: 2 }, { q: 6 }, { p: 3 }));
```

Output:

```[object Object] {
p: 1,
q: 2
}
```

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