I am looking to generate a series of lottery numbers like the following:
my list could be between 1 - 100, or it might range from 1 - 200, or even 1 - 300
This task must be completed using only Javascript.
Illustrated below is a concise example where the script generates a list of random numbers ranging from 0 to 10 (you have the option to alter the range by adjusting the values for min/max in the getRandomInt(min, max) function).
The argument in getNumbers(times) specifies how many times you wish to select a number from the pool.
It's worth noting that this example may select a number multiple times on different interactions (since this requirement was not mentioned in the original question).
(function() {
var getRandomInt = function(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
};
var getNumbers = function(times) {
for (var i = 0; i < times; i++) {
console.log(getRandomInt(0, 100));
}
};
console.log('---------- Selecting 35 numbers randomly');
getNumbers(35);
console.log('---------- Selecting 25 numbers randomly');
getNumbers(25);
console.log('---------- Selecting 10 numbers randomly');
getNumbers(10);
})();
The modified version below only selects unique numbers (as per your request in the comment):
(function() {
var usedNumbers = [];
var getRandomInt = function(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
};
var getNumbers = function(times) {
for (var i = 0; i < times; i++) {
var number = getRandomInt(0, 100);
if (usedNumbers.indexOf(number) === -1) {
usedNumbers.push(number);
console.log(number);
}
}
};
console.log('---------- Selecting 35 unique numbers');
getNumbers(35);
console.log('---------- Selecting 25 unique numbers');
getNumbers(25);
console.log('---------- Selecting 10 unique numbers');
getNumbers(10);
})();
Presented below is the function I devised, designed to compare each generated random number with previous numbers in order to prevent duplicates. Additionally, it allows for exclusion of specific numbers (such as those from prior attempts) by passing them as arguments to the exc parameter within the function.
var lottery = function (min, max, size, exc) {
var results = []
, isDuplicate = false
, random = 0;
exc = exc || [];
for (var i = 0; i < size; i++) {
isDuplicate = true
while (isDuplicate) {
random = Math.floor(Math.random() * (max - min + 1)) + min;
if (results.indexOf(random) === -1 && exc.indexOf(random) === -1) {
results.push(random);
isDuplicate = false
}
}
}
return results;
}
var firstRun = lottery(1,100,35);
console.log(firstRun);
var secondRun = lottery(1,100,25,firstRun);
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