Our Highest Common Factor code in Javascript.
List Highest Common Factor Javascript File:
var common_factors = []; // factors common to our group_of_numbers
var index = 0; // index into array common_factors
var state_all_round_factor = false; // variable to keep state
var i = 2; // start checking for factors from variable 2
/* Pass of Array(according to javascript) is by reference;
so make a copy that will be passed instead. */
var arg_copy = [];
/*
* Our function checks 'group_of_numbers';
* If it finds a factor common to all fo it, it records this factor;
* then divides 'group_of_numbers' by the common factor found
* and makes this the new 'group_of_numbers'.
* It continues recursively until all common factors are found.
*/
function getHCFFactors(operate_on) {
while (i <= operate_on[0]) {
state_all_round_factor = true;
// STEP 2:
for (var j = 0; j < operate_on.length; j++) {
if (!(state_all_round_factor == true && (operate_on[j] % i) == 0)) {
state_all_round_factor = false;
}
}
// STEP 3:
if (state_all_round_factor == true) {
for (var j = 0; j < operate_on.length; j++) {
operate_on[j] /= i;
}
common_factors[index++] = i;
// STEP 4:
return getHCFFactors(operate_on);
}
i++;
}
return;
}
function getHCF(group) {
// STEP 1:
// Sort in ascending order
group_of_numbers.sort(
function (a, b) {
return a - b;
}
);
for (var j = 0; j < group.length; j++) {
arg_copy[j] = group[j];
}
getHCFFactors(arg_copy);
var HCF = 1;
for (var k = 0; k < common_factors.length; k++) {
HCF *= common_factors[k];
}
return HCF;
}HTML File:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Find H.C.F.</title>
<script src="HCF.js"></script>
</head>
<body>
<h4>Highest Common Factors of a Group of Numbers.</h4>
<div id="myHCF"></div>
<script>
/*
* 'group_of_numbers' holds the numbers whose HCF we are trying to find.
* Add as many of these numbers as you wish by extending the array.
*/
var group_of_numbers = [];
group_of_numbers[0] = 14;
group_of_numbers[1] = 49;
group_of_numbers[2] = 21;
group_of_numbers[3] = 42;
var result = getHCF(group_of_numbers); // call to our function
document.getElementById("myHCF").innerHTML =
"The H.C.F. of " + group_of_numbers.join(", ") + " is: " + result;
</script>
</body>
</html>Try it out!
Elegance (0.0)
