print random amount of words from a text file - node.js

Question

I have a text file containing 100 words. I would like my programme to select a random number of words between 1 - 7 from the 100 words in the text file to print.
I know how to get a random number
var ranNum = Math.floor(Math.random() * 7) +1 ;
but not sure how to get my programme to select a random amount of words as determined by ranNum
function randomWord(){
var fs = require('fs');
var readME = fs.readFileSync('text.txt', 'utf8', function(err,data) {
//reads text file
console.log(data);
});
console.log(readME);
//returns a random num between 1-9
var ranNum = Math.floor(Math.random() * 7) + 1;
console.log(ranNum); //prints out that number
}
randomWord();
I want my programme to select a random amout of words from the text file each time it is run

Answer 1

If you want to get n random words from a text file and the text file consists of a string like this:
apple, orange, banana, pear, elephant, horse, dog, cow, brazil, england, france
You can use the following code:
// declare 'require()' imports at the top of your script
var fs = require('fs');
function randomWords(words){
// Since you use 'readFileSync', there is no callback function
var readME = fs.readFileSync('text.txt', 'utf8');
// Split the string into an array
var wordArr = readME.split(', ');
// Check if the specified amount of words is bigger than
// the actual array length (word count) so we don't end
// up in an infinite loop
words = words > wordArr.length ? wordArr.length : words;
// Create empty array
var randWords = [];
// push a random word to the new array n times
for (let i = 0; i < words; i++){
// new random number
let newRandom;
do {
// New random index based on the length of the array (word count)
let rand = Math.floor(Math.random() * wordArr.length);
newRandom = wordArr[rand];
}
// Make sure we don't have duplicates
while (randWords.includes(newRandom));
// Add the new word to the array
randWords.push(newRandom);
}
// Join the array to a string and return it
return randWords.join(', ');
}
// You can pass the amount of words you want to the function
console.log(randomWords(5));
I commented the code for clarification.
Working Repl.it Demo: Demo