3 examples of 'fibonacci series program in javascript using functions' in JavaScript

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export default function* fibonacci() {
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    let f = (a, b) => a + b;
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    let s = series(f, 1, 1);
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    let predicate = n => n < Number.MAX_SAFE_INTEGER;
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    yield* takeWhile(s, predicate);
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}

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function fibonacci(num) {
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    var n = Number(num);
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    var first = 0;
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    var second = 1;
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    var result = 0;
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    for (var i = 1; i <= n; i++) {
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    	result = first + second;
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    	first = second;
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    	second = result;
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        console.log(i + ": " + first + "\n");
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    }
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}

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function fibonacci( n ) {
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	if ( n < 2 ) {
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		return n;
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	}
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	return fibonacci( n-1 ) + fibonacci( n-2 );
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}