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What should every JavaScript programmer know? [closed]
Is there a set of things that every JavaScript programmer should know to be able to say "I know JavaScript"?
30 Answers
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Make a link open a new window (not tab) [duplicate]
...a way to make a link open a new browser window (not tab) without using javascript?
5 Answers
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How to loop through array in jQuery?
...e odds are you'd have other problems; details).
ES5's forEach:
As of ECMAScript5, arrays have a forEach function on them which makes it easy to loop through the array:
substr.forEach(function(item) {
// do something with `item`
});
Link to docs
(Note: There are lots of other functions, not...
Check if a variable is a string in JavaScript
... is a String";
var stringObject = new String( "This is a String Object" );
alert(typeof booleanValue) // displays "boolean"
alert(typeof numericalValue) // displays "number"
alert(typeof stringValue) // displays "string"
alert(typeof stringObject) // displays "object"
Example from this webpage. (E...
How can a Javascript object refer to values in itself? [duplicate]
...it ",
key2: function() {
return this.key1 + " works!";
}
};
alert(obj.key2());
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JavaScript Date Object Comparison
...ed, and two objects are never equal to each other. Coerce them to number:
alert( +startDate2 == +startDate3 ); // true
If you want a more explicity conversion to number, use either:
alert( startDate2.getTime() == startDate3.getTime() ); // true
or
alert( Number(startDate2) == Number(startDate3)...
How do you detect the clearing of a “search” HTML5 input?
...ome, maybe others). Is there a way to detect when this X is clicked in Javascript or jQuery other than, say, detecting when the box is clicked at all or doing some sort of location click-detecting (x-position/y-position)?
...
What is this 'Lambda' everyone keeps speaking of?
... {
if (numbers[i] % 2 === 0) {
even.push(numbers[i]);
}
}
alert(even);
// Using the filter method
even = [1, 2, 3, 4].filter(function (number) {
return number % 2 === 0;
});
alert(even);
Code execution delay
In some environments, in which the concept of event is available, ...
How to make script execution wait until jquery is loaded
...t jquery hasn't finished loading before it is being called by a subsequent script. Is there a way to check for the existence of jquery and if it doesn't exist, wait for a moment and then try again?
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How to determine whether an object has a given property in JavaScript
...roperty, opts)) {
throw new Error("IllegalArgumentException");
}
alert("ok");
}
f({req1: 123}); // error
f({req1: 123, req2: 456}); // ok
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