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How do I find out if first character of a string is a number?

...owLowRepImageUploadWarning: true, reputationToPostImages: 10, bindNavPrevention: true, postfix: "", imageUploader: { brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\...
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What is the difference between pluck and collect in Rails?

... answered Aug 29 '12 at 10:43 apneadivingapneadiving 109k2525 gold badges208208 silver badges207207 bronze badges ...
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Comparing strings by their alphabetical order

... answered Dec 4 '18 at 12:10 arenaqarenaq 1,90811 gold badge1818 silver badges2727 bronze badges ...
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Python: changing value in a tuple

...uence, the memory consumption of tuple (60-bytes for one-element) vs list (104 bytes) and make a difference. Another use case is for namedtuples since namedlist doesn't natively exist. – Michael Scott Cuthbert Aug 2 '15 at 17:46 ...
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Select N random elements from a List in C#

...his algorithm. – Ankur Goel Feb 22 '10 at 22:52 23 ok, I ran this algorithm 10 million times on a...
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Check if class already assigned before adding

... 10 There's far too much attitude in this answer. Could have answered it with some tact. – dreadwail Feb...
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iOS difference between isKindOfClass and isMemberOfClass

... answered Sep 6 '10 at 19:43 Sebastian CelisSebastian Celis 11.9k66 gold badges3232 silver badges4444 bronze badges ...
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What does new self(); mean in PHP?

... | edited Jul 16 '17 at 10:36 Ryall 10.9k1010 gold badges4545 silver badges7171 bronze badges answered...
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How to tell if a file is git tracked (by shell exit code)?

... answered Mar 9 '10 at 5:12 hasenhasen 144k6161 gold badges174174 silver badges221221 bronze badges ...
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How to create the most compact mapping n → isprime(n) up to a limit N?

...sent every odd number with one bit e.g. for the given range of numbers (1, 10], starts at 3: 1110 31 Answers ...