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How to count certain elements in array?
...Very simple:
var count = 0;
for(var i = 0; i < array.length; ++i){
if(array[i] == 2)
count++;
}
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regex.test V.S. string.match to know if a string matches a regular expression
Many times I'm using the string match function to know if a string matches a regular expression.
3 Answers
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Detect IF hovering over element with jQuery
... looking for an action to call when hovering, but instead a way to tell if an element is being hovered over currently. For instance:
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JavaScript: remove event listener
...t.
var click_count = 0;
function myClick(event) {
click_count++;
if(click_count == 50) {
// to remove
canvas.removeEventListener('click', myClick);
}
}
// to add
canvas.addEventListener('click', myClick);
EDIT: You could close around the click_counter variable like t...
Check if all values of array are equal
... might be a bit late to the party... i think this doesn't work if your array is made of falses! for example try [false, false, false].reduce(function(a, b){return (a === b)?a:false;});
– George Flourentzos
Nov 27 '14 at 19:21
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Sort array of objects by single key with date value
...ated_at),
keyB = new Date(b.updated_at);
// Compare the 2 dates
if (keyA < keyB) return -1;
if (keyA > keyB) return 1;
return 0;
});
console.log(arr);
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Best way to alphanumeric check in JavaScript
... 0, len = str.length; i < len; i++) {
code = str.charCodeAt(i);
if (!(code > 47 && code < 58) && // numeric (0-9)
!(code > 64 && code < 91) && // upper alpha (A-Z)
!(code > 96 && code < 123)) { // lower alpha (a-z)
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Returning null as an int permitted with ternary operator but not if statement
... rules for the conditional operator (as described in the Java Language Specification, 15.25), and moves happily on. This will generate a NullPointerException at run time, which you can confirm by trying it.
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How to break out of jQuery each Loop
...to a continue in a normal loop.
$.each(array, function(key, value) {
if(value === "foo") {
return false; // breaks
}
});
// or
$(selector).each(function() {
if (condition) {
return false;
}
});
s...
When to use .First and when to use .FirstOrDefault with LINQ?
...the check. (It is bad practice and might hurt performance).
Finally, the difference between First() and Take(1) is that First() returns the element itself, while Take(1) returns a sequence of elements that contains exactly one element.
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