JavaScript: Check whether a point lies strictly inside a given circle
JavaScript Basic: Exercise-120 with Solution
Write a JavaScript program to check whether a point lies strictly inside a given circle.
Input:
Center of the circle (x, y)
Radius of circle: r
Point inside a circle (a, b)
Sample Solution:
HTML Code:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title> Check whether a point lies strictly inside a given circle</title>
</head>
<body>
</body>
</html>
JavaScript Code:
function check_a_point(a, b, x, y, r) {
var dist_points = (a - x) * (a - x) + (b - y) * (b - y);
r *= r;
if (dist_points < r) {
return true;
}
return false;
}
console.log(check_a_point(0, 0, 2, 4, 6));
console.log(check_a_point(0, 0, 6, 8, 6));
Sample Output:
true false
Flowchart:
ES6 Version:
function check_a_point(a, b, x, y, r) {
var dist_points = (a - x) * (a - x) + (b - y) * (b - y);
r *= r;
if (dist_points < r) {
return true;
}
return false;
}
console.log(check_a_point(0, 0, 2, 4, 6));
console.log(check_a_point(0, 0, 6, 8, 6));
Live Demo:
See the Pen javascript-basic-exercise-120 by w3resource (@w3resource) on CodePen.
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Next: Write a JavaScript program to check whether a given matrix is lower triangular or not.
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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
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