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Just a simple string-to-int algorithm

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Octocat-spinner-32 lib
Octocat-spinner-32 spec
Octocat-spinner-32 README.md
README.md

String-to-integer

This is a simple string to integer conversion algorithm, done without the assistance of ruby's builtin String#to_i. Obviously, this is just meant for learning and not for actual production use.

It is compatible with Ruby 1.8.7 and above.

Running the specs

gem install rspec -v=2.1.0
rspec spec/string_to_integer_spec.rb --format documentation

StringToInteger#to_integer
  converts '-100' to -100
  converts '-99' to -99
  converts '-98' to -98
  converts '-97' to -97
  converts '-96' to -96
  converts '-95' to -95
  converts '-94' to -94
  converts '-93' to -93
  converts '-92' to -92
  converts '-91' to -91
  converts '-90' to -90
  converts '-89' to -89
  converts '-88' to -88
  converts '-87' to -87
  converts '-86' to -86
  converts '-85' to -85
  converts '-84' to -84
  converts '-83' to -83
  converts '-82' to -82
  converts '-81' to -81
  converts '-80' to -80
  converts '-79' to -79
  converts '-78' to -78
  converts '-77' to -77
  converts '-76' to -76
  converts '-75' to -75
  converts '-74' to -74
  converts '-73' to -73
  converts '-72' to -72
  converts '-71' to -71
  converts '-70' to -70
  converts '-69' to -69
  converts '-68' to -68
  converts '-67' to -67
  converts '-66' to -66
  converts '-65' to -65
  converts '-64' to -64
  converts '-63' to -63
  converts '-62' to -62
  converts '-61' to -61
  converts '-60' to -60
  converts '-59' to -59
  converts '-58' to -58
  converts '-57' to -57
  converts '-56' to -56
  converts '-55' to -55
  converts '-54' to -54
  converts '-53' to -53
  converts '-52' to -52
  converts '-51' to -51
  converts '-50' to -50
  converts '-49' to -49
  converts '-48' to -48
  converts '-47' to -47
  converts '-46' to -46
  converts '-45' to -45
  converts '-44' to -44
  converts '-43' to -43
  converts '-42' to -42
  converts '-41' to -41
  converts '-40' to -40
  converts '-39' to -39
  converts '-38' to -38
  converts '-37' to -37
  converts '-36' to -36
  converts '-35' to -35
  converts '-34' to -34
  converts '-33' to -33
  converts '-32' to -32
  converts '-31' to -31
  converts '-30' to -30
  converts '-29' to -29
  converts '-28' to -28
  converts '-27' to -27
  converts '-26' to -26
  converts '-25' to -25
  converts '-24' to -24
  converts '-23' to -23
  converts '-22' to -22
  converts '-21' to -21
  converts '-20' to -20
  converts '-19' to -19
  converts '-18' to -18
  converts '-17' to -17
  converts '-16' to -16
  converts '-15' to -15
  converts '-14' to -14
  converts '-13' to -13
  converts '-12' to -12
  converts '-11' to -11
  converts '-10' to -10
  converts '-9' to -9
  converts '-8' to -8
  converts '-7' to -7
  converts '-6' to -6
  converts '-5' to -5
  converts '-4' to -4
  converts '-3' to -3
  converts '-2' to -2
  converts '-1' to -1
  converts '0' to 0
  converts '1' to 1
  converts '2' to 2
  converts '3' to 3
  converts '4' to 4
  converts '5' to 5
  converts '6' to 6
  converts '7' to 7
  converts '8' to 8
  converts '9' to 9
  converts '10' to 10
  converts '11' to 11
  converts '12' to 12
  converts '13' to 13
  converts '14' to 14
  converts '15' to 15
  converts '16' to 16
  converts '17' to 17
  converts '18' to 18
  converts '19' to 19
  converts '20' to 20
  converts '21' to 21
  converts '22' to 22
  converts '23' to 23
  converts '24' to 24
  converts '25' to 25
  converts '26' to 26
  converts '27' to 27
  converts '28' to 28
  converts '29' to 29
  converts '30' to 30
  converts '31' to 31
  converts '32' to 32
  converts '33' to 33
  converts '34' to 34
  converts '35' to 35
  converts '36' to 36
  converts '37' to 37
  converts '38' to 38
  converts '39' to 39
  converts '40' to 40
  converts '41' to 41
  converts '42' to 42
  converts '43' to 43
  converts '44' to 44
  converts '45' to 45
  converts '46' to 46
  converts '47' to 47
  converts '48' to 48
  converts '49' to 49
  converts '50' to 50
  converts '51' to 51
  converts '52' to 52
  converts '53' to 53
  converts '54' to 54
  converts '55' to 55
  converts '56' to 56
  converts '57' to 57
  converts '58' to 58
  converts '59' to 59
  converts '60' to 60
  converts '61' to 61
  converts '62' to 62
  converts '63' to 63
  converts '64' to 64
  converts '65' to 65
  converts '66' to 66
  converts '67' to 67
  converts '68' to 68
  converts '69' to 69
  converts '70' to 70
  converts '71' to 71
  converts '72' to 72
  converts '73' to 73
  converts '74' to 74
  converts '75' to 75
  converts '76' to 76
  converts '77' to 77
  converts '78' to 78
  converts '79' to 79
  converts '80' to 80
  converts '81' to 81
  converts '82' to 82
  converts '83' to 83
  converts '84' to 84
  converts '85' to 85
  converts '86' to 86
  converts '87' to 87
  converts '88' to 88
  converts '89' to 89
  converts '90' to 90
  converts '91' to 91
  converts '92' to 92
  converts '93' to 93
  converts '94' to 94
  converts '95' to 95
  converts '96' to 96
  converts '97' to 97
  converts '98' to 98
  converts '99' to 99
  converts '100' to 100
  raises an error for "-ab"
  raises an error for "ab"

Finished in 0.09698 seconds
203 examples, 0 failures
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