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Tribonacci series in JavaScript
Tribonacci Series:
The tribonacci sequence is a generalization of the Fibonacci sequence where each term is the sum of the three preceding terms.
For example, the first few terms of the tribonacci series are −
0,1,1,2,4,7,13,24,44,81,149
We are required to write a JavaScript function that takes in a number, say num, as the only argument.
The function should then return an array of num elements, containing the first num terms of the tribonacci series.
For example:
f(6) = 0,
Example
Following is the code:
const tribonacci = (num = 1) => {
if (num === 0 || num === 1 || num === 2){
return 0;
};
if (num == 3){
return 1;
}else{
return tribonacci(num - 1) +
tribonacci(num - 2) +
tribonacci(num - 3);
}
}
const trib = num => {
const res = [];
for (let i = 1; i <= num; i++){
res.push(tribonacci(i));
};
return res
};
console.log(trib(15));Output
Following is the console output −
[ 2, 1, 4, 3, 6, 5 ]
Updated on: 18-Jan-2021
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