Stringをどうにかする / Managing Solidity String

by Ryo Manzoku

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4USJOHΛͲ͏ʹ͔͢Δ CMPDLDIBJOUPLZP EPVCMFKVNQUPLZPגࣜձࣾ ϦʔυΤϯδχΞຬ଍྄

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w 3FCVJMEJOHUIFGVUVSFPGHBNJOH  XJUICMPDLDIBJOUFDIOPMPHZ w ೥݄૑ۀ w ϒϩοΫνΣʔϯήʔϜઐۀ։ൃձࣾ w ैۀһਓʢۀ຿ҕୗΛؚΉʣ w ϒϩοΫνΣʔϯʹ೤ҙͷ͋ΔΤϯδχΞΛੵۃ࠾༻தͰ͢ʂ EPVCMFKVNQUPLZPגࣜձࣾ

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w ຬ଍྄ʢ.BO[PLV3ZPʣ w EPVCMFKVNQUPLZPϦʔυΤϯδχΞ w ೥݄ΑΓΠϯϑϥઃܭӡ༻ɺαʔόαΠυ։ൃɺ 4NBSU$POUSBDU։ൃɺϒϩοΫνΣʔϯٕज़ௐࠪͳͲΛ୲౰ w աڈʹ͸ιʔγϟϧήʔϜձࣾɺ&E5FDIΞϓϦձࣾͰΠϯϑ ϥΤϯδχΞͱͯ͠"84Λத৺ͱͨ͠Ϋϥ΢υΠϯϑϥ͔ΒΞ ϓϦ·ͰͷશମઃܭɺߏஙɺվળΛܦݧ ࣗݾ঺հ

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4PMJEJUZॻ͍ͯ·͔͢ʁ

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4USJOHܕ࢖͍·͔͢ʁ

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)FMMP8PSMEҎ֎Ͱ࢖͏͜ͱ͋Δͷʁ

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&3$.FUBEBUB

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&3$63*

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&UISFVN͔Β֎ͷੈքΛࢀর͢Δ ৔߹ʹ࢖͏

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4PMJEJUZEPFTOPUIBWFTUSJOHNBOJQVMBUJPOGVODUJPOT CVUUIFSFBSFUIJSEQBSUZTUSJOHMJCSBSJFT https://solidity.readthedocs.io/en/v0.5.13/types.html#bytes-and-strings-as-arrays

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Ͳ͏ʹ͔͍͖ͯ͠·͠ΐ͏

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w MFO TUS w TUSMFOHUI w CZUFT TUS MFOHUI 2จࣈྻͷ௕͞

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w MFO TUS w 4PMJEJUZʹ૊ΈࠐΈͷMFO ͸ଘࡏ͠ͳ͍ w TUSMFOHUI w .FNCFSMFOHUIOPUGPVOEPSOPUWJTJCMFBGUFS BSHVNFOUEFQFOEFOUMPPLVQJOMJUFSBM@TUSJOH w CZUFT TUS MFOHUI w ˓ "จࣈྻͷ௕͞

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TUSJOHJTFRVBMUPCZUFTCVUEPFT OPUBMMPXMFOHUIPSJOEFYBDDFTT https://solidity.readthedocs.io/en/v0.5.13/ types.html#bytes-and-strings-as-arrays

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w TUSTUS w LFDDBL TUS LFDDBL TUS w LFDDBL BCJFODPEF1BDLFE T LFDDBL BCJFOD PEF1BDLFE T 2จࣈྻͷൺֱ

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w TUSTUS w ඇਪ঑ w LFDDBL TUS LFDDBL TUS w ͪΐͬͱલ·Ͱ͜Ε͕ਪ঑͞Ε͍ͯͨ w LFDDBL BCJFODPEF1BDLFE T LFDDBL BCJFOD PEF1BDLFE T w ˓W͔ΒυΩϡϝϯτʹొ৔ "จࣈྻͷൺֱ

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w TUSTUS w CZUFT TUS CZUFT TUS w BCJFODPEF1BDLFE TUS TUS w Ͳ͏ʹ͔͢Δ 2จࣈྻͷ࿈݁

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w TUSTUS w TUSJOH͸"SSBZͳͷͰ͸࢖͑·ͤΜ w CZUFT TUS CZUFT TUS w CZUFT͸"SSBZͳͷͰ͸࢖͑·ͤΜ w BCJFODPEF1BDLFE TUS TUS w ˓W͔ΒυΩϡϝϯτʹొ৔ w Ͳ͏ʹ͔͢Δ "จࣈྻͷ࿈݁

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BCJFODPEF1BDLFEΛ஌Βͳ͔ͬͨࠒ

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w TUS<> w CZUFT<> w Ͳ͏ʹ͔͢Δ 2จࣈྻͷ੾ΓऔΓ

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w TUS<> w TUSJOHJTFRVBMUPCZUFTCVUEPFTOPUBMMPXMFOHUIPS JOEFYBDDFTT w CZUFT<> w Έ͍ͨͳΞΫηε͸Ͱ͖ͳ͍ɻจࣈ͚ͩͳΒ͜ΕͰ΋Մ w Ͳ͏ʹ͔͢Δ w ˓ "จࣈྻͷ੾ΓऔΓ

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Ͳ͏ʹ͔͢Δ

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w TUSJOH J w TUSJOH BCJFODPEF1BDLFE J w Ͳ͏ʹ͔͢Δ 2VJOUͷจࣈྻԽ

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w TUSJOH J w ͦΜͳ؁͘ͳ͍ w TUSJOH BCJFODPEF1BDLFE J w Ͱ͖Δ͔ͳͱࢥ͚ͬͨͲͦΜͳ؁͘ͳ͍ w Ͳ͏ʹ͔͢Δ w ˓ "VJOUͷจࣈྻԽ

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Ͳ͏ʹ͔͢Δ

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w BEESTUSJOH w TUSJOH BEES w TUSJOH BCJFODPEF1BDLFE BEES w Ͳ͏ʹ͔͢Δ 2BEESFTTͷจࣈྻԽ

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w BEESTUSJOH w ͦΜͳ؁͘ͳ͍ w TUSJOH BEES w &YQMJDJUUZQFDPOWFSTJPOOPUBMMPXFE w TUSJOH BCJFODPEF1BDLFE BEES w &YQMJDJUUZQFDPOWFSTJPOOPUBMMPXFE w Ͳ͏ʹ͔͢Δˠ˓ "BEESFTTͷจࣈྻԽ

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Ͳ͏ʹ͔͢Δ

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w Ͳ͏ʹ͔͢Δ 2จࣈྻͷ4QMJU

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΄Μͱʹ͜ΕΛ΍Δͷʁ

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4PMJEJUZEPFTOPUIBWFTUSJOHNBOJQVMBUJPOGVODUJPOT CVUUIFSFBSFUIJSEQBSUZTUSJOHMJCSBSJFT

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044Ͱެ։ͯ͠·͢ʂ IUUQTHJUIVCDPN EPVCMFKVNQUPLZPNDIQMVTDPOUSBDUT

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ϚΠΫϦΛ࢝ΊΑ͏ʂ https://mch.gg/start ট଴ίʔυ͸ ʮTHA4ʯ  Λೖྗʂ