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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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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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