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Challenges Truthify an array

JavaScript (Node.js), 74 70 bytes Works for any number of dimensions. f=(a,z=[])=>a.map?.((b,c)=>z.push(...f(b).map(a=>[c,...a])))?z:a?[z]:z Try it online! (TIO uses an old version ...

posted 3y ago by Hakerh400‭  ·  edited 3y ago by Hakerh400‭

Answer
#4: Post edited by user avatar Hakerh400‭ · 2021-01-09T15:30:07Z (over 3 years ago)
  • # [JavaScript (Node.js)], <del>74</del> 70 bytes
  • <!-- language-all: lang-javascript -->
  • f=(a,z=[])=>a.map?.((b,c)=>z.push(...f(b).map(a=>[c,...a])))?z:a?[z]:z
  • [Try it online!](https://tio.run/##VVCxbsMgEN39FYyHRBGsjoj3DunQETEQ16SuEmMZEin8vAOYxraQ7h7v3b2D@9MP7dqpH/3HYH@6eTYCNAlCKiyOmt702FCAM2njNdDx7n6BUmrgjJMGWhxlSyKjFca4CbVuZFB1mFs7OI9857xDAskKIUZi4ClIlSNbEi@JMMLzKfyO2VKKvDPbiv8NWecFMcI2PQlFuPSlQUVnxYuvrtlXyveTcuWCVm7vuZ20Vu7d02PVoaqMnWDdEbJm2RWOP0m0vXb0ai/w@f11os5P/XDpzRMMpKq46cP8Ag) (TIO uses an old version of Node.js that does not support the `?.` operator, but you can try the [74 bytes](https://tio.run/##VVCxjsMgDN3zFYxYogjWVmn3DnfDjYjBJVClakMVuEr9@hwQrkmEZD89Pz8b3/CFwYz9M@4G39lpci22R@QPfJ6Qj7b7NZbSCzOsg/Z44cYPBiN11EDW0CRWHeOcowZgSsMeT0ppvVd6StoQSbQhBtIS1RAiWAoyB6VLFHOSNTHBZHmV3zBrSrNPFuvif0Opy4oEE6uejBKc@/KgWhfVSy6uxVepz0pFOaOF23quJy3KrXteVh@axvmRLjci3s23gvSTTPu75Xd/peef7y8e4tgP19690@mzCgAO0x8) solution)
  • [JavaScript (Node.js)]: https://nodejs.org
  • # [JavaScript (Node.js)], <del>74</del> 70 bytes
  • Works for any number of dimensions.
  • <!-- language-all: lang-javascript -->
  • f=(a,z=[])=>a.map?.((b,c)=>z.push(...f(b).map(a=>[c,...a])))?z:a?[z]:z
  • [Try it online!](https://tio.run/##VVCxbsMgEN39FYyHRBGsjoj3DunQETEQ16SuEmMZEin8vAOYxraQ7h7v3b2D@9MP7dqpH/3HYH@6eTYCNAlCKiyOmt702FCAM2njNdDx7n6BUmrgjJMGWhxlSyKjFca4CbVuZFB1mFs7OI9857xDAskKIUZi4ClIlSNbEi@JMMLzKfyO2VKKvDPbiv8NWecFMcI2PQlFuPSlQUVnxYuvrtlXyveTcuWCVm7vuZ20Vu7d02PVoaqMnWDdEbJm2RWOP0m0vXb0ai/w@f11os5P/XDpzRMMpKq46cP8Ag) (TIO uses an old version of Node.js that does not support the `?.` operator, but you can try the [74 bytes](https://tio.run/##VVCxjsMgDN3zFYxYogjWVmn3DnfDjYjBJVClakMVuEr9@hwQrkmEZD89Pz8b3/CFwYz9M@4G39lpci22R@QPfJ6Qj7b7NZbSCzOsg/Z44cYPBiN11EDW0CRWHeOcowZgSsMeT0ppvVd6StoQSbQhBtIS1RAiWAoyB6VLFHOSNTHBZHmV3zBrSrNPFuvif0Opy4oEE6uejBKc@/KgWhfVSy6uxVepz0pFOaOF23quJy3KrXteVh@axvmRLjci3s23gvSTTPu75Xd/peef7y8e4tgP19690@mzCgAO0x8) solution)
  • [JavaScript (Node.js)]: https://nodejs.org
#3: Post edited by user avatar Hakerh400‭ · 2021-01-09T15:27:40Z (over 3 years ago)
  • # [JavaScript (Node.js)], 74 bytes
  • Works for any number of dimensions.
  • <!-- language-all: lang-javascript -->
  • f=a=>a.map?a.reduce((b,c,d)=>b.concat(f(c).map(a=>[d,...a])),[]):a?[[]]:[]
  • [Try it online!][TIO-kjpjo3sd]
  • [JavaScript (Node.js)]: https://nodejs.org
  • [TIO-kjpjo3sd]: https://tio.run/##VVCxjsMgDN3zFYxYogjWVmn3DnfDjYjBJVClakMVuEr9@hwQrkmEZD89Pz8b3/CFwYz9M@4G39lpci22R@QPfJ6Qj7b7NZbSCzOsg/Z44cYPBiN11EDW0CRWHeOcowZgSsMeT0ppvVd6StoQSbQhBtIS1RAiWAoyB6VLFHOSNTHBZHmV3zBrSrNPFuvif0Opy4oEE6uejBKc@/KgWhfVSy6uxVepz0pFOaOF23quJy3KrXteVh@axvmRLjci3s23gvSTTPu75Xd/peef7y8e4tgP19690@mzCgAO0x8 "JavaScript (Node.js) – Try It Online"
  • # [JavaScript (Node.js)], <del>74</del> 70 bytes
  • <!-- language-all: lang-javascript -->
  • f=(a,z=[])=>a.map?.((b,c)=>z.push(...f(b).map(a=>[c,...a])))?z:a?[z]:z
  • [Try it online!](https://tio.run/##VVCxbsMgEN39FYyHRBGsjoj3DunQETEQ16SuEmMZEin8vAOYxraQ7h7v3b2D@9MP7dqpH/3HYH@6eTYCNAlCKiyOmt702FCAM2njNdDx7n6BUmrgjJMGWhxlSyKjFca4CbVuZFB1mFs7OI9857xDAskKIUZi4ClIlSNbEi@JMMLzKfyO2VKKvDPbiv8NWecFMcI2PQlFuPSlQUVnxYuvrtlXyveTcuWCVm7vuZ20Vu7d02PVoaqMnWDdEbJm2RWOP0m0vXb0ai/w@f11os5P/XDpzRMMpKq46cP8Ag) (TIO uses an old version of Node.js that does not support the `?.` operator, but you can try the [74 bytes](https://tio.run/##VVCxjsMgDN3zFYxYogjWVmn3DnfDjYjBJVClakMVuEr9@hwQrkmEZD89Pz8b3/CFwYz9M@4G39lpci22R@QPfJ6Qj7b7NZbSCzOsg/Z44cYPBiN11EDW0CRWHeOcowZgSsMeT0ppvVd6StoQSbQhBtIS1RAiWAoyB6VLFHOSNTHBZHmV3zBrSrNPFuvif0Opy4oEE6uejBKc@/KgWhfVSy6uxVepz0pFOaOF23quJy3KrXteVh@axvmRLjci3s23gvSTTPu75Xd/peef7y8e4tgP19690@mzCgAO0x8) solution)
  • [JavaScript (Node.js)]: https://nodejs.org
#2: Post edited by user avatar Hakerh400‭ · 2021-01-09T10:12:08Z (over 3 years ago)
  • # [JavaScript (Node.js)], 74 bytes
  • Works for any number of dimensions.
  • <!-- language-all: lang-javascript -->
  • f=a=>a.map?a.reduce((b,c,d)=>b.concat(f(c).map(a=>[d,...a])),m=[]):a?[m]:m
  • [Try it online!][TIO-kjpjcqsm]
  • [JavaScript (Node.js)]: https://nodejs.org
  • [TIO-kjpjcqsm]: https://tio.run/##jY8xD4MgEIX3/hJIrgRXG3Xv0A4dCcOJaGxEjNom/fUWRasujWG4F@5778ET39iptmz6c20zPQx5hFGMzGCTIGt19lKakBQUZDSKU6ZsrbAnOVF0ZIiDRQaMMZSUgomEpCEmwsjQDI7tbKVZZQtyfdxvrOvbsi7K/OP8IgAOwXS4s9LL6T@@448bJPwmP25dyiZ3MCsOfJM4Kid9qstd9nxuCtbOsRWEWB7vSa/Wu33mtmkl9@n@K8MX "JavaScript (Node.js) – Try It Online"
  • # [JavaScript (Node.js)], 74 bytes
  • Works for any number of dimensions.
  • <!-- language-all: lang-javascript -->
  • f=a=>a.map?a.reduce((b,c,d)=>b.concat(f(c).map(a=>[d,...a])),[]):a?[[]]:[]
  • [Try it online!][TIO-kjpjo3sd]
  • [JavaScript (Node.js)]: https://nodejs.org
  • [TIO-kjpjo3sd]: https://tio.run/##VVCxjsMgDN3zFYxYogjWVmn3DnfDjYjBJVClakMVuEr9@hwQrkmEZD89Pz8b3/CFwYz9M@4G39lpci22R@QPfJ6Qj7b7NZbSCzOsg/Z44cYPBiN11EDW0CRWHeOcowZgSsMeT0ppvVd6StoQSbQhBtIS1RAiWAoyB6VLFHOSNTHBZHmV3zBrSrNPFuvif0Opy4oEE6uejBKc@/KgWhfVSy6uxVepz0pFOaOF23quJy3KrXteVh@axvmRLjci3s23gvSTTPu75Xd/peef7y8e4tgP19690@mzCgAO0x8 "JavaScript (Node.js) – Try It Online"
#1: Initial revision by user avatar Hakerh400‭ · 2021-01-09T10:03:49Z (over 3 years ago)
# [JavaScript (Node.js)], 74 bytes

Works for any number of dimensions.

<!-- language-all: lang-javascript -->

    f=a=>a.map?a.reduce((b,c,d)=>b.concat(f(c).map(a=>[d,...a])),m=[]):a?[m]:m

[Try it online!][TIO-kjpjcqsm]

[JavaScript (Node.js)]: https://nodejs.org
[TIO-kjpjcqsm]: https://tio.run/##jY8xD4MgEIX3/hJIrgRXG3Xv0A4dCcOJaGxEjNom/fUWRasujWG4F@5778ET39iptmz6c20zPQx5hFGMzGCTIGt19lKakBQUZDSKU6ZsrbAnOVF0ZIiDRQaMMZSUgomEpCEmwsjQDI7tbKVZZQtyfdxvrOvbsi7K/OP8IgAOwXS4s9LL6T@@448bJPwmP25dyiZ3MCsOfJM4Kid9qstd9nxuCtbOsRWEWB7vSa/Wu33mtmkl9@n@K8MX "JavaScript (Node.js) – Try It Online"