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What's the difference between ES6 Map and WeakMap?

Looking this and this MDN pages it seems like the only difference between Maps and WeakMaps is a missing "size" property for WeakMaps. But is this true? What's the difference between them? ...
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Saving an Object (Data persistence)

I've created an object like this: 4 Answers 4 ...
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In Java, how do I check if a string contains a substring (ignoring case)? [duplicate]

I have two String s, str1 and str2 . How do I check if str2 is contained within str1 , ignoring case? 6 Answers ...
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The model backing the context has changed since the database was created

... share | improve this answer | follow | edited Sep 8 '16 at 5:52 Youngjae 20.4k1414 gold b...
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Getting All Variables In Scope

Is there a way to get all variables that are currently in scope in javascript? 10 Answers ...
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Rotating a two-dimensional array in Python

...wo-dimensional array came up. Searching for the optimal solution I found this impressive one-liner that does the job: 7 Ans...
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Why declare unicode by string in python?

... -*- coding: utf-8 -*-, you're telling Python the source file you've saved is utf-8. The default for Python 2 is ASCII (for Python 3 it's utf-8). This just affects how the interpreter reads the characters in the file. In general, it's probably not the best idea to embed high unicode characters in...
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In Firebase, is there a way to get the number of children of a node without loading all the node dat

...you add a new child. You could use a transaction to count items, like in this code tracking upvodes: var upvotesRef = new Firebase('https://docs-examples.firebaseio.com/android/saving-data/fireblog/posts/-JRHTHaIs-jNPLXOQivY/upvotes'); upvotesRef.transaction(function (current_value) { return (cur...
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Remove last item from array

... share | improve this answer | follow | edited Aug 3 at 10:48 CroMagnon 1,21877 gold badge...
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Is there a way to word-wrap long words in a div?

...now Internet Explorer has a word-wrap style, but I'd like to know if there is a cross-browser method of doing so to text in a div. ...