11 Matching Annotations
- Feb 2021
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stackoverflow.com stackoverflow.com
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The problem is that you what you want is actually not de-structuring at all. You’re trying to go from 'arg1', { hash2: 'bar', hash3: 'baz' }, { hash1: 'foo' } (remember that 'arg1', foo: 'bar' is just shorthand for 'arg1', { foo: 'bar' }) to 'arg1', { hash1: 'foo', hash2: 'bar', hash3: 'baz' } which is, by definition, merging (note how the surrounding structure—the hash—is still there). Whereas de-structuring goes from 'arg1', [1, 2, 3] to 'arg1', 1, 2, 3
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{a: 1, b: 2, c: 3, d: 4} => {a:, b:, **rest} # a == 1, b == 2, rest == {:c=>3, :d=>4}
equivalent in javascript:
{a, b, ...rest} = {a: 1, b: 2, c: 3, d: 4}
Not a bad replacement for that! I still find javascript's syntax a little more easily readable and natural, but given that we can't use the same syntax (probably because it would be incompatible with existing syntax rules that we can't break for compatibility reasons, unfortunately), this is a pretty good compromise/solution that they've come up with.
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- Oct 2020
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www.npmjs.com www.npmjs.com
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Leverages hash-based routing, which is optimal for SPAs and doesn't require any server-side processing
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- Jan 2020
- Oct 2018
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www.nuke24.net www.nuke24.net
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hash-archive.org hash-archive.org
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tools.ietf.org tools.ietf.org
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8. Examples 8.1. Hello World! The following ni URI is generated from the text "Hello World!" (12 characters without the quotes), using the sha-256 algorithm shown with and without an authority field: ni:///sha-256;f4OxZX_x_FO5LcGBSKHWXfwtSx-j1ncoSt3SABJtkGk ni://example.com/sha-256;f4OxZX_x_FO5LcGBSKHWXfwtSx-j1ncoSt3SABJtkGk The following HTTP URL represents a mapping from the previous ni name based on the algorithm outlined above. http://example.com/.well-known/ni/sha-256/ f4OxZX_x_FO5LcGBSKHWXfwtSx-j1ncoSt3SABJtkGk
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github.com github.com
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hash://sha256/9f86d081884c7d659a2feaa0?type=text/plain#top \__/ \____/ \______________________/ \_____________/ \_/ | | | | | scheme algorithm hash query fragment
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- Feb 2018
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www.ruanyifeng.com www.ruanyifeng.com
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imgHash.py
具体实现:
#!/usr/bin/python import glob import os import sys from PIL import Image EXTS = 'jpg', 'jpeg', 'JPG', 'JPEG', 'gif', 'GIF', 'png', 'PNG' def avhash(im): if not isinstance(im, Image.Image): im = Image.open(im) im = im.resize((8, 8), Image.ANTIALIAS).convert('L') avg = reduce(lambda x, y: x + y, im.getdata()) / 64. return reduce(lambda x, (y, z): x | (z << y), enumerate(map(lambda i: 0 if i < avg else 1, im.getdata())), 0) def hamming(h1, h2): h, d = 0, h1 ^ h2 while d: h += 1 d &= d - 1 return h if __name__ == '__main__': if len(sys.argv) <= 1 or len(sys.argv) > 3: print "Usage: %s image.jpg [dir]" % sys.argv[0] else: im, wd = sys.argv[1], '.' if len(sys.argv) < 3 else sys.argv[2] h = avhash(im) os.chdir(wd) images = [] for ext in EXTS: images.extend(glob.glob('*.%s' % ext)) seq = [] prog = int(len(images) > 50 and sys.stdout.isatty()) for f in images: seq.append((f, hamming(avhash(f), h))) if prog: perc = 100. * prog / len(images) x = int(2 * perc / 5) print '\rCalculating... [' + '#' * x + ' ' * (40 - x) + ']', print '%.2f%%' % perc, '(%d/%d)' % (prog, len(images)), sys.stdout.flush() prog += 1 if prog: print for f, ham in sorted(seq, key=lambda i: i[1]): print "%d\t%s" % (ham, f)
参考代码:
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- Sep 2017
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clubmate.fi clubmate.fi
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Associative arrays in bash
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