Question

我有一个以下语法的对象文字：

const loader = {
    "0": "b",
    "1": "a",
    "2": "r",
    // arbitrary extra fields:
    "foo": 123,
    "quux": 456,
}

我想将其转换为数组["b", "a", "r"]，然后转换为字符串"bar"，这是我的最终目标。我不需要任何额外的字段，如果有的话，可以安全地丢弃它们。

很有可能使用Array.from(loader)，但遗憾的是Array.from期望length属性存在，而我没有。

鉴于在我的情况下不保证对象文字键顺序，这是我迄今为止提出的最简洁的解决方案：

function convert(obj) {
    const a = [];
    for (const k in obj) {
        a[k] = obj[k];
    }
    return a.join('');
}

虽然我不喜欢它，但它对我来说似乎是多余的和不优雅的。有什么我可能错过的吗？我可以自由使用ES6中的任何东西。

Answer 1

您可以转换对象的数组，并将连接的值作为字符串。

＆＃13;

var loader = { 0: "b", 1: "a", 2: "r", foo: 123, quux: 456 },
    string = Object.assign([], loader).join('');
    
console.log(string);

＆＃13;

Answer 2

使用Object.keys，filter，map和join

var output = Object.keys( loader ) //get the keys
              .filter( s => !isNaN( s ) ) //remove non-numeric keys
              .map( s => loader[s] ) //get values for filtered keys
              .join( "" ); //join them

如果需要明确地对键进行排序，那么

var output = Object.keys( loader ) //get the keys
              .filter( s => !isNaN( s ) ) //remove non-numeric keys
              .sort( ( a, b ) => a - b );
              .map( s => loader[s] ) //get values for filtered keys
              .join( "" ); //join them

Answer 3

使用Incident Identifier: A1D97BC0-1ADC-4BBB-9E93-B715BFCAB1F9 CrashReporter Key: 76499241dcdacdbbbe8b2d13cec556a542d621f2 Hardware Model: xxx1 Process: xxxx [8001] Path: /private/var/containers/Bundle/Application/F3EE3E40-C05D-45C7-83B4-124F597DB19A/Yall.app/Yall Identifier: xxxxxxxx Version: 1.0.9 (1.0) Code Type: ARM-64 (Native) Role: Foreground Parent Process: launchd [1] Coalition: xxxxxxxx [2900] Date/Time: 2018-03-05 10:43:50.1248 -0800 Launch Time: 2018-03-05 10:43:47.9739 -0800 OS Version: iPhone OS 11.2.6 (15D100) Baseband Version: n/a Report Version: 104 Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Exception Note: EXC_CORPSE_NOTIFY Triggered by Thread: 0 Application Specific Information: abort() called Filtered syslog: None found Last Exception Backtrace: (0x183a9f164 0x182ce8528 0x1894a7ca8 0x1044ef0a0 0x1044ed6ac 0x18d6f6ca4 0x18d6fb298 0x18d1d3a14 0x18d08ab50 0x18d6e4b08 0x18d6e4678 0x18d6e37d4 0x18d088e5c 0x18d059e7c 0x18d9af30c 0x18d9b1898 0x18d9aa7b0 0x183a4777c 0x183a476fc 0x183a46f84 0x183a44b5c 0x183964c58 0x185810f84 0x18d0bd5c4 0x10445944c 0x18348456c) Thread 0 name: Dispatch queue: com.apple.main-thread Thread 0 Crashed: 0 libsystem_kernel.dylib 0x00000001835b42e8 0x183592000 + 140008 1 libsystem_pthread.dylib 0x00000001836c92f8 0x1836c6000 + 13048 2 libsystem_c.dylib 0x0000000183522fbc 0x1834c0000 + 405436 3 libc++abi.dylib 0x0000000182cbf068 0x182cbd000 + 8296 4 libc++abi.dylib 0x0000000182cbf210 0x182cbd000 + 8720 5 libobjc.A.dylib 0x0000000182ce8810 0x182ce0000 + 34832 6 libc++abi.dylib 0x0000000182cd754c 0x182cbd000 + 107852 7 libc++abi.dylib 0x0000000182cd7158 0x182cbd000 + 106840 8 libobjc.A.dylib 0x0000000182ce86e8 0x182ce0000 + 34536 9 CoreFoundation 0x0000000183964cc4 0x18395c000 + 36036 10 GraphicsServices 0x0000000185810f84 0x185806000 + 44932 11 UIKit 0x000000018d0bd5c4 0x18d04a000 + 472516 12 Yall 0x000000010445944c 0x104454000 + 21580 13 libdyld.dylib 0x000000018348456c 0x183483000 + 5484 Thread 1: 0 libsystem_kernel.dylib 0x00000001835b4d80 0x183592000 + 142720 1 libsystem_pthread.dylib 0x00000001836c6eec 0x1836c6000 + 3820 2 libsystem_pthread.dylib 0x00000001836c6b6c 0x1836c6000 + 2924 Thread 2: 0 libsystem_pthread.dylib 0x00000001836c6b68 0x1836c6000 + 2920 Thread 3 name: com.apple.uikit.eventfetch-thread Thread 3: 0 libsystem_kernel.dylib 0x0000000183593568 0x183592000 + 5480 1 libsystem_kernel.dylib 0x00000001835933e0 0x183592000 + 5088 2 CoreFoundation 0x0000000183a47108 0x18395c000 + 962824 3 CoreFoundation 0x0000000183a44cd4 0x18395c000 + 953556 4 CoreFoundation 0x0000000183964c58 0x18395c000 + 35928 5 Foundation 0x0000000184399594 0x18438d000 + 50580 6 Foundation 0x00000001843b89ac 0x18438d000 + 178604 7 UIKit 0x000000018dc277a8 0x18d04a000 + 12441512 8 Foundation 0x000000018449b0f4 0x18438d000 + 1106164 9 libsystem_pthread.dylib 0x00000001836c82b4 0x1836c6000 + 8884 10 libsystem_pthread.dylib 0x00000001836c8180 0x1836c6000 + 8576 11 libsystem_pthread.dylib 0x00000001836c6b74 0x1836c6000 + 2932 Thread 4: 0 libsystem_kernel.dylib 0x00000001835b4d80 0x183592000 + 142720 1 libsystem_pthread.dylib 0x00000001836c6eec 0x1836c6000 + 3820 2 libsystem_pthread.dylib 0x00000001836c6b6c 0x1836c6000 + 2924 Thread 5: 0 libsystem_kernel.dylib 0x00000001835b4d80 0x183592000 + 142720 1 libsystem_pthread.dylib 0x00000001836c6eec 0x1836c6000 + 3820 2 libsystem_pthread.dylib 0x00000001836c6b6c 0x1836c6000 + 2924 Thread 6: 0 libsystem_pthread.dylib 0x00000001836c6b68 0x1836c6000 + 2920 Thread 7: 0 libsystem_pthread.dylib 0x00000001836c6b68 0x1836c6000 + 2920 Thread 8 name: AVAudioSession Notify Thread Thread 8: 0 libsystem_kernel.dylib 0x0000000183593568 0x183592000 + 5480 1 libsystem_kernel.dylib 0x00000001835933e0 0x183592000 + 5088 2 CoreFoundation 0x0000000183a47108 0x18395c000 + 962824 3 CoreFoundation 0x0000000183a44cd4 0x18395c000 + 953556 4 CoreFoundation 0x0000000183964c58 0x18395c000 + 35928 5 AVFAudio 0x00000001892cdcd4 0x189244000 + 564436 6 AVFAudio 0x00000001892f8740 0x189244000 + 739136 7 libsystem_pthread.dylib 0x00000001836c82b4 0x1836c6000 + 8884 8 libsystem_pthread.dylib 0x00000001836c8180 0x1836c6000 + 8576 9 libsystem_pthread.dylib 0x00000001836c6b74 0x1836c6000 + 2932 Thread 9 name: com.apple.NSURLConnectionLoader Thread 9: 0 libsystem_kernel.dylib 0x0000000183593568 0x183592000 + 5480 1 libsystem_kernel.dylib 0x00000001835933e0 0x183592000 + 5088 2 CoreFoundation 0x0000000183a47108 0x18395c000 + 962824 3 CoreFoundation 0x0000000183a44cd4 0x18395c000 + 953556 4 CoreFoundation 0x0000000183964c58 0x18395c000 + 35928 5 CFNetwork 0x0000000184253b08 0x184020000 + 2308872 6 Foundation 0x000000018449b0f4 0x18438d000 + 1106164 7 libsystem_pthread.dylib 0x00000001836c82b4 0x1836c6000 + 8884 8 libsystem_pthread.dylib 0x00000001836c8180 0x1836c6000 + 8576 9 libsystem_pthread.dylib 0x00000001836c6b74 0x1836c6000 + 2932 Thread 0 crashed with ARM Thread State (64-bit): x0: 0x0000000000000000 x1: 0x0000000000000000 x2: 0x0000000000000000 x3: 0x00000001c02e57b7 x4: 0x0000000182cdcafd x5: 0x000000016b9ab4e0 x6: 0x000000000000006e x7: 0xffffffffffffffec x8: 0x0000000008000000 x9: 0x0000000004000000 x10: 0x00000001836cd5e0 x11: 0x0000000000000003 x12: 0xffffffffffffffff x13: 0x0000000000000001 x14: 0x000000018353953f x15: 0x0000000000000010 x16: 0x0000000000000148 x17: 0x00000000ffffffff x18: 0xfffffff017e9925c x19: 0x0000000000000006 x20: 0x00000001b46eeb80 x21: 0x000000016b9ab4e0 x22: 0x0000000000000303 x23: 0x00000001b46eec60 x24: 0x00000001c4001d90 x25: 0x0000000000000000 x26: 0x0000000000000001 x27: 0x0000000000000000 x28: 0x000000016b9abb38 fp: 0x000000016b9ab440 lr: 0x00000001836c92f8 sp: 0x000000016b9ab410 pc: 0x00000001835b42e8 cpsr: 0x00000000 Binary Images: 0x104454000 - 0x104557fff Yall arm64 <95dc9e309fe836be9987d128e9be8c14> /var/containers/Bundle/Application/F3EE3E40-C05D-45C7-83B4-124F597DB19A/Yall.app/Yall 0x1045c4000 - 0x1045f7fff AFNetworking arm64 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libsystem_kernel.dylib arm64 <6ca465bb9c013f9ab3fb24dd16418142> /usr/lib/system/libsystem_kernel.dylib 0x1835bb000 - 0x1835e8fff libsystem_m.dylib arm64 <a75c726ec49b3f48b83593be165afcfa> /usr/lib/system/libsystem_m.dylib 0x1835e9000 - 0x183603fff libsystem_malloc.dylib arm64 <cce71425b3483c5fa3718246e8e27ed2> /usr/lib/system/libsystem_malloc.dylib 0x183604000 - 0x1836a4fff libsystem_network.dylib arm64 <cac262c32d6938abb9075481187087c4> /usr/lib/system/libsystem_network.dylib 0x1836a5000 - 0x1836b0fff libsystem_networkextension.dylib arm64 <40f740c2ec9b37cebe6043eecbd1927d> /usr/lib/system/libsystem_networkextension.dylib 0x1836b1000 - 0x1836bbfff libsystem_notify.dylib arm64 <c204b6b2ef2d38669fb985bc64f26a6b> /usr/lib/system/libsystem_notify.dylib 0x1836bc000 - 0x1836c5fff libsystem_platform.dylib arm64 <1fd32dd6f1da3029ae0fe5875eaceb94> /usr/lib/system/libsystem_platform.dylib 0x1836c6000 - 0x1836d5fff libsystem_pthread.dylib arm64 <2f9b440f88eb3cedb786b4b98586d78f> /usr/lib/system/libsystem_pthread.dylib 0x1836d6000 - 0x1836d9fff libsystem_sandbox.dylib arm64 <001e1a85480c3b07b93861fe7e69843b> /usr/lib/system/libsystem_sandbox.dylib 0x1836da000 - 0x1836e1fff libsystem_symptoms.dylib arm64 <56e7c311193139968b729073897fbdc6> /usr/lib/system/libsystem_symptoms.dylib 0x1836e2000 - 0x1836f5fff libsystem_trace.dylib arm64 <8b98d3487b6e3b72863670eb57c3b4ff> /usr/lib/system/libsystem_trace.dylib 0x1836f6000 - 0x1836fbfff libunwind.dylib arm64 <a9da0d0735093dc38005623608c0f71e> /usr/lib/system/libunwind.dylib 0x1836fc000 - 0x1836fcfff libvminterpose.dylib arm64 <c1577063af17384b8091f9923960a1f1> /usr/lib/system/libvminterpose.dylib 0x1836fd000 - 0x183727fff libxpc.dylib arm64 <1732d812fa793d159965e668759a42df> /usr/lib/system/libxpc.dylib 0x183728000 - 0x183949fff libicucore.A.dylib arm64 <32c272e1e9f735aba4c16a17580f13e3> /usr/lib/libicucore.A.dylib 0x18394a000 - 0x18395bfff libz.1.dylib arm64 <c402ff63470b34df8634f2078cd151e1> /usr/lib/libz.1.dylib 0x18395c000 - 0x183cf1fff CoreFoundation arm64 <846f4b1542383c98991c1314902e3d72> /System/Library/Frameworks/CoreFoundation.framework/CoreFoundation 0x183cf2000 - 0x183d02fff libbsm.0.dylib arm64 <b7a56e43a852351d8a2dab94c7fc04e6> /usr/lib/libbsm.0.dylib 0x183d03000 - 0x183d03fff libenergytrace.dylib arm64 <6adeca3b70ed33dda70a16353c5ef6ce> /usr/lib/libenergytrace.dylib 0x183d04000 - 0x183d89fff IOKit arm64 <938f5f32ece43551a651b777bd44d431> /System/Library/Frameworks/IOKit.framework/Versions/A/IOKit 0x183d8a000 - 0x183e73fff libxml2.2.dylib arm64 <33530216f58333d993d4acb846c63aac> /usr/lib/libxml2.2.dylib 0x183e74000 - 0x183e81fff libbz2.1.0.dylib arm64 <35c6ddde076638589f755656ac0058ce> /usr/lib/libbz2.1.0.dylib 0x183e82000 - 0x183e9afff liblzma.5.dylib arm64 <7d5815f117103d15a67fd30b3375b11b> /usr/lib/liblzma.5.dylib 0x183e9b000 - 0x183ff8fff libsqlite3.dylib arm64 <eac933b033d43444ae182e2d7de6137f> /usr/lib/libsqlite3.dylib 0x183ff9000 - 0x18401ffff libMobileGestalt.dylib arm64 <dc43249a916a3294a98ae31871591dd9> /usr/lib/libMobileGestalt.dylib 0x184020000 - 0x18438cfff CFNetwork arm64 <1b8095865d8a3b84a9cbe0d5d0354fc1> /System/Library/Frameworks/CFNetwork.framework/CFNetwork 0x18438d000 - 0x184688fff Foundation arm64 <dad046ce90513de69c6ca86d7184b7c2> /System/Library/Frameworks/Foundation.framework/Foundation 0x184689000 - 0x184777fff Security arm64 <11c28a235f0d34a483d4c0c6d3a72617> /System/Library/Frameworks/Security.framework/Security 0x184778000 - 0x1847e4fff SystemConfiguration arm64 <e4021e13feec30af8e612a49060b1ad1> /System/Library/Frameworks/SystemConfiguration.framework/SystemConfiguration 0x1847e5000 - 0x18481bfff libCRFSuite.dylib arm64 <faed949ffe90353091a2916aef415302> /usr/lib/libCRFSuite.dylib 0x18481c000 - 0x18481cfff libapple_crypto.dylib arm64 <7b69ce788b6f3bd581d76b857760c614> /usr/lib/libapple_crypto.dylib 0x18481d000 - 0x184833fff libapple_nghttp2.dylib arm64 <ff88135792b639679509b309f0c0cad9> /usr/lib/libapple_nghttp2.dylib 0x184834000 - 0x18485dfff libarchive.2.dylib arm64 <957aea53942d3afc91420044f6ae5112> /usr/lib/libarchive.2.dylib 0x18485e000 - 0x18490ffff libboringssl.dylib arm64 <a515a4c41d7337dd85ed1db0cb3d1a09> /usr/lib/libboringssl.dylib 0x184910000 - 0x184927fff libcoretls.dylib arm64 <c2287d06413f32c2aee0e6c3313d98c7> /usr/lib/libcoretls.dylib 0x184928000 - 0x184929fff libcoretls_cfhelpers.dylib arm64 <79276edd953836b698947c5db28c83ad> /usr/lib/libcoretls_cfhelpers.dylib 0x18492a000 - 0x18492bfff liblangid.dylib arm64 <11d94ede5ab1300a820d96e3374f53fa> /usr/lib/liblangid.dylib 0x18492c000 - 0x1849fffff libnetwork.dylib arm64 <e4a37ecffec3327bb37e3fd427c92b87> /usr/lib/libnetwork.dylib 0x184a00000 - 0x184a32fff libpcap.A.dylib arm64 <419a8dd2325a326c81b4b02d849ce562> /usr/lib/libpcap.A.dylib 0x184a33000 - 0x184a67fff libusrtcp.dylib arm64 <227ec64866e53676828e76f89c1e4928> /usr/lib/libusrtcp.dylib 0x184a68000 - 0x184a71fff IOSurface arm64 <76764bfa34e8365e8263c8ec57868e70> /System/Library/Frameworks/IOSurface.framework/IOSurface 0x184a72000 - 0x184b17fff libBLAS.dylib arm64 <05ecdd31f9573a069c0e8b3d610bbc3f> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libBLAS.dylib 0x184b18000 - 0x184e47fff libLAPACK.dylib arm64 <3e55f73c8a4c329d8bb7f5e58ed687c3> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libLAPACK.dylib 0x184e48000 - 0x1850b4fff vImage arm64 <7fabce5d1fe83c38aa998440146eb09b> /System/Library/Frameworks/Accelerate.framework/Frameworks/vImage.framework/vImage 0x1850b5000 - 0x1850c6fff libSparseBLAS.dylib arm64 <88335b280db13b3d812ee89998bc363c> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libSparseBLAS.dylib 0x1850c7000 - 0x1850ebfff libvMisc.dylib arm64 <20da313fe2343db189a04c72928eb120> /System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/libvMisc.dylib只获得那些数字。 isNaN会在输出数组中订购sort，然后通过该键访问，您可以通过keys从loader对象获取值，或者只使用reduce然后是map。

＆＃13;

join

＆＃13;

将对象转换为数组的最佳方法

3 个答案: