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Check if a variable is a string in JavaScript
...n-style answer, I thought it might be worth redoing my answer in a simpler form that everybody can understand.
function isString(x) {
return Object.prototype.toString.call(x) === "[object String]"
}
Or, inline (I have an UltiSnip setup for this):
Object.prototype.toString.call(myVar) === "[obj...
What are OLTP and OLAP. What is the difference between them?
...
Very clear information. Thank you for sharing it helped me clear my doubts.
– CapturedTree
Jul 23 '16 at 4:25
...
Test for existence of nested JavaScript object key
... function, using ES6 features and recursion (it's also in proper tail call form):
function checkNested(obj, level, ...rest) {
if (obj === undefined) return false
if (rest.length == 0 && obj.hasOwnProperty(level)) return true
return checkNested(obj[level], ...rest)
}
However, if you...
How to extend an existing JavaScript array with another array, without creating a new array
...ill be fine).
There's also some nice ECMAScript 6 sugar for this in the form of the spread operator:
const a = [1, 2, 3];
const b = [...a, 5, 4, 3];
(It also copies.)
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SAML vs federated login with OAuth
... problems.
SAML is a set of standards that have been defined to share information about who a user is, what his set of attributes are, and give you a way to grant/deny access to something or even request authentication.
OAuth is more about delegating access to something. You are basically all...
SVG fill color transparency / alpha?
...ion 62 (was previously supported from version 54 with the Experimental Platform Features flag enabled).
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__proto__ VS. prototype in JavaScript
...ess to all the properties in its proto chain as linked by __proto__ , thus forming the basis for prototypal inheritance.
__proto__ is not a standard way of accessing the prototype chain, the standard but similar approach is to use Object.getPrototypeOf(obj).
Below code for instanceof operator give...
Remove duplicated rows using dplyr
... = sample(0:1, 10, replace = T),
z = 1:10
)
# In each group of rows formed by combinations of x and y
# retain only the first row
df %>%
group_by(x, y) %>%
slice(1)
Difference from using the distinct() function
The advantage of this solution is that it makes it expli...
WatiN or Selenium? [closed]
... and Selenium . Which do you prefer for automated testing of ASP.NET web forms? Which of these products work better for you?
...
How to forward declare a template class in namespace std?
...identifier, then it's not guaranteed to compile or run correctly: it's ill-formed. Also prohibited are names beginning with an underscore followed by a capital letter, among others. In general, don't start things with underscores unless you know what magic you're dealing with.
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