collatzSequence - Collatz sequence for a number (as iterator). returns final 1 and initial number [1030361]

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< > BotCompany Repo | #1030361 // collatzSequence - Collatz sequence for a number (as iterator). returns final 1 and initial number

JavaX fragment (include) [tags: use-pretranspiled]

Libraryless. Click here for Pure Java version (2754L/17K).

static ItIt<BigInt> collatzSequence(long n) {
  ret collatzSequence(bigInt(n));
}

static ItIt<BigInt> collatzSequence(BigInt _n) {
  ret new ItIt<BigInt> {
    BigInt three = bigInt(3);
    BigInt n;
    
    public bool hasNext() {
      ret neq(n, BigInt.ONE);
    }
    
    public BigInt next() {
      if (n == null) ret n = _n; // first number
      if (even(n.intValue()))
        n = div(n, BigInt.TWO);
      else
        n = plus(mul(n, three), BigInt.ONE);
      ret n;
    }
  };
}

Author comment

Began life as a copy of #1030359

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Travelled to 4 computer(s): bhatertpkbcr, mqqgnosmbjvj, pyentgdyhuwx, vouqrxazstgt

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Snippet ID:	#1030361
Snippet name:	collatzSequence - Collatz sequence for a number (as iterator). returns final 1 and initial number
Eternal ID of this version:	#1030361/4
Text MD5:	1e7e86c1ee37560ee7ca9cca99940d32
Transpilation MD5:	1e3078bfd9392994c31d0155bdb21f96
Author:	stefan
Category:	javax / maths
Type:	JavaX fragment (include)
Public (visible to everyone):	Yes
Archived (hidden from active list):	No
Created/modified:	2020-12-09 15:12:00
Source code size:	516 bytes / 23 lines
Pitched / IR pitched:	No / No
Views / Downloads:	394 / 511
Version history:	3 change(s)
Referenced in:	[show references]

1	static ItIt<BigInt> collatzSequence(long n) {
2	ret collatzSequence(bigInt(n));
3	}
4
5	static ItIt<BigInt> collatzSequence(BigInt _n) {
6	ret new ItIt<BigInt> {
7	BigInt three = bigInt(3);
8	BigInt n;
9
10	public bool hasNext() {
11	ret neq(n, BigInt.ONE);
12	}
13
14	public BigInt next() {
15	if (n == null) ret n = _n; // first number
16	if (even(n.intValue()))
17	n = div(n, BigInt.TWO);
18	else
19	n = plus(mul(n, three), BigInt.ONE);
20	ret n;
21	}
22	};
23	}