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javascript Programming Glossary: operandWhat is the instanceof operator in JavaScript? http://stackoverflow.com/questions/2449254/what-is-the-instanceof-operator-in-javascript improve this question instanceof The Left Hand Side LHS operand is the actual object being tested to the Right Hand Side RHS.. the actual object being tested to the Right Hand Side RHS operand which is the actual constructor of a class. The basic definition..
What does “options = options || {}” mean in Javascript? http://stackoverflow.com/questions/2851404/what-does-options-options-mean-in-javascript object. The Logical OR operator will return its second operand if the first one is falsy . Falsy values are 0 null undefined..
In Javascript, what does it mean when there is a logical operator in a variable declaration? http://stackoverflow.com/questions/3088098/in-javascript-what-does-it-mean-when-there-is-a-logical-operator-in-a-variable falsy . The boolean operators in JavaScript can return an operand and not always a boolean result as in other languages. The Logical.. The Logical OR operator returns the value of its second operand if the first one is falsy otherwise the value of the first operand.. if the first one is falsy otherwise the value of the first operand is returned. For example foo bar returns foo false bar returns..
(![]+[])[+[]]… Explain why this works http://stackoverflow.com/questions/4170978/explain-why-this-works expression between parentheses is composed by the first operand of the Addition operator is and it will produce false because.. falsey NaN true it was falsey After it we have the second operand of the addition an empty Array this is made just to convert..
What do these Javascript operators do? http://stackoverflow.com/questions/4535328/what-do-these-javascript-operators-do shift left and right respectively. If you imagine the left operand as a binary sequence of bits you are shifting those to the left.. left or right by the number of bits indicated by the right operand. ^ These are bitwise and xor and or respectively. You can think.. the counterparts to and except that they will treat their operands as bit vectors and perform the logical operations on each of..
null coalescing operator for javascript? http://stackoverflow.com/questions/476436/null-coalescing-operator-for-javascript Clarification Regardless of the type of the first operand if casting it to a Boolean results in false the assignment will.. results in false the assignment will use the second operand. Beware of all the cases below alert Boolean null false alert..
Whats the significant use of Unary Plus and Minus operators? http://stackoverflow.com/questions/5450076/whats-the-significant-use-of-unary-plus-and-minus-operators improve this question The Unary operator converts its operand to Number type. The Unary operator converts its operand to Number.. operand to Number type. The Unary operator converts its operand to Number type and then negates it. per the ECMAScript spec..
Can you explain why ++[[]][+[]]+[+[]] = “10”? http://stackoverflow.com/questions/7202157/can-you-explain-why-10 says 11.4.6 Unary Operator The unary operator converts its operand to Number type. The production UnaryExpression UnaryExpression.. as 11.4.6 Unary Operator The unary operator converts its operand to Number type. The production UnaryExpression UnaryExpression..
JavaScript inheritance and the constructor property http://stackoverflow.com/questions/8093057/javascript-inheritance-and-the-constructor-property The instanceof operator is a binary operator it has two operands . It operates on an instance object and a constructor function... the prototype chain of the instance object the first operand and compares the internal proto property of each object to the.. prototype property of the constructor function the second operand . If they match it returns true and else if the prototype chain..
http://stackoverflow.com/questions/9032856/what-is-the-explanation-for-these-bizarre-javascript-behaviours-mentioned-in-the When using the addition operator both the left and right operands are converted to primitives first ยง11.6.1 . As per ยง9.1 converting.. empty strings which is the empty string. Similar to both operands are converted to primitives first. For Object objects ยง15.2.. . The unary operator ยง11.4.6 returns ToNumber ToPrimitive operand . As we already know ToPrimitive is the empty string and according..
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