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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:

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

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

</body>
</html>

JavaScript Code:

function twice3040(arra1) {
    let a = arra1[0],
        b = arra1[1];
    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([30]));

Sample Output:

true
true
false
true

Flowchart:

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

ES6 Version:

function twice3040(arra1) {
    let a = arra1[0];
    let b = arra1[1];
    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([30]));

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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Next: Write a JavaScript program to swap the first and last elements of a given array of integers. The array length should be at least 1.

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JavaScript: Tips of the Day

Returns the sum of the powers of all the numbers from start to end (both inclusive)

Example:

const sumPower = (end, power = 2, start = 1) =>
  Array(end + 1 - start)
    .fill(0)
    .map((x, i) => (i + start) ** power)
    .reduce((a, b) => a + b, 0);
console.log(sumPower(10)); // 385
console.log(sumPower(10, 3)); // 3025
console.log(sumPower(10, 3, 5)); // 2925 

Output:

385
3025
2925