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Arithmetic operators for JavaScript

ECMAScript defines 5 arithmetic operators, plus, minus, multiply, divide, and modulo (take-up). If the value of the arithmetic operation is not numeric, then the background will first convert it to a numeric value (implicit conversion) using the number () transformation function.One, additionvarbox = 1 + 2;//equals 3    varbox = 1 + NaN;//Nan, as long as one nan is Nan    varbox = Infinity + Infinity;//

3. Operators

the valuevar box = '-box//-89 '; value string converted to numeric valuevar box = ' ab ';-box//nan, string contains non-numeric converted to NaNvar box = false;-box//0, Boolean converted to corresponding valuevar box = 2.3;-box//-2.3, no changevar box = {Tostring:function () {return 1;}-box;}//-1, do not set ToString or valueof is NanNote: addition and subtraction are generally used for arithmetic operations, and type conversions can be made to the above.Three, arithmetic operatorsECMAScript de

JS Basic Concepts (3)

of the binary code;2 "To find the binary of the anti-code, will be 0 to replace 1, 1 is replaced by 0;"3 "Get the binary Anti-code plus 1.// 18 binary code 0000 0000 0000 0000 0000 0000 0001 0010// negation code 1111 1111 1111 1111 1111 1111 1110 1101// Anti-code plus 1 1//———————————————————————————— ————————————————————————————————————————————————// 1111 1111 1111 1111 1111 1111 1110 1110

"JavaScript Advanced Program Design" Reading notes---operation selector

operators is comparable to equal operators. If you do not have the ability to test two value relationships, statements such as if...else and loops will be useless. There are 3 Boolean operators: Non (not), with (and), and or (or).1. Logical Non-The logical non-operator consists of an exclamation mark (! ) represents any value that can be applied to the ECMAScript. Regardless of the data type of this value, this operator returns a Boolean value. The logical non-operator first converts its operan

Basic concepts of JavaScript (iv) --- operators and javascript Operators

of 134217726. 3. boolean operator 3. 1. Non-logical Logical non-operator (!) This operator can be used for any value in ECMAScript to return a Boolean value. When this operator is used for the value, the current value is first converted to a Boolean value, and then reverse it. The specific conversion rules are as follows: I. If the operand is an object, false is returned; Ii. If the operand is a Null String, true is returned; Iii. If the operand is a non-null string, false is returned; Iv. If t

The setting technique of infinite constants in programming "0X3F3F3F3F"

the technique of setting infinite constants in programmingIf the scope of the data in the problem is clear, then the infinite setting is not a problem, in the ambiguous case, many programmers take 0x7fffffff as infinity, because this is the maximum value of 32-bit int. If this infinity is used only for general comparisons (such as the initial value of the min variable at the minimum), then 0x7fffffff is a p

JavaScript Advanced Programming (eight): basic concept-Operator

rules: Different values to get 1".8, Boolean operators: Logical non (not) logic and (and) logic or (or) 3 operations.9, logical non (!) ) can be used with any data type and returns a Boolean value. Rules for logical non-operator adherence:1) null, undefined, NaN, empty string, 0 will return true;2) returns false for non-empty strings, objects, non-0 values (including Infinity Infinity)  Summary : You can d

JS Basics Review: The syntax of ECMAScript (iii)

default all integers in ECMAScript are signed integers.Of course there are unsigned integers, and for unsigned integers the 32nd bit no longer represents symbols because unsigned integers can only be positive numbers, unsigned integers because they have one extra bit to represent a larger number.When you apply a bit operation to a special Nan and infinity value, both values are treated as a limit.If you apply a bitwise operator to a non-numeric value

Beyond Turing-Turing--on the possibility of the realization of artificial intelligence (I.)

artificial intelligence has been a Turing test for nearly a century, but I think the Turing test is a far-fetched test to determine whether life cannot be relied upon for such tests. Must begin with the essential meaning of life. And this "self-awareness" is possible-see if you can identify yourself. It suddenly occurred to me that the whole recursive theory was about self-awareness. A recursive function is a form of life that is self-aware-so powerful that when recursive function calls itself

Chapter III Basic Concepts

operatorAutomatic type conversions are performed in cases where the operand is not a numeric value.1. Multiplication (*)Special rules:1, the operand is the numerical value, performs the conventional multiplication computation;2, there is Nan, then nan;3, Infinity by 0, for Nan;4, Infinity by non 0, for Infinity or-infinity

JavaScript Advanced Programming (3rd Edition) Chapter III reading notes

type is only two literals: true and false,true do not necessarily equal 1,false not necessarily equal to 0. Conversion rules for various data types and Boolean types Data type The value converted to true Value converted to False Boolean True False String Any non-empty string "" (empty string) Number Any non-0 numeric value (including infinity) 0

JS Basic Three

are objects, the second object is returned. Returns null if one of the operands is null. If an operand is Nan, a nan is returned. If an operand is undefined, an error occurs. 12 . The logical AND operator is represented by the double ampersand (). 13. The logical OR operator is represented by a double vertical bar (| | Said14, multiplication also has some special behavior: If the result is too large or too small, the resulting result is

JavaScript Advanced Programming Reading notes (vi) operators in ECMAScript (ii) _javascript tips

2.9.5, additive operator Additive operators (that is, plus and minus signs) are usually the simplest operators, but in ECMAScript, each additive operator has a large number of special behaviors. 1. Addition Operator: Copy Code code as follows: var iresult=1+2; Console.log (Iresult);//outputs 3 Particularity: A certain op is Nan, and the result is Nan. Infinity Plus infinity, the

Introduction to the principle of ECC encryption algorithm

basic of Modern algebra," "Elementary number Theory," such as books, it is best for you to turn first, which is helpful for you to understand this article. Don't be afraid, I try to make the language more popular, I hope this article can become a stepping stone to learn ECC.First, from parallel lines.Parallel lines, never intersect. No one doubts that: but in modern times this conclusion has been questioned. Will parallel lines intersect far and far away? No one has actually seen it. So "parall

Multi-View Geometry--Introduction (I.)

straightness can be preserved. The results show that this is the most general requirement for mapping, and we can define a projective transformation of a plane as any mapping of points that maintain a straight line on a plane. To understand why we need projective geometry, we start with the familiar Euclidean geometry. This is the geometry that describes the angle and shape of the object. Euclidean geometry is a major problem-we need to constantly infer some basic concepts of geometry-such as t

Cryptography in 1.3.2 Blockchain--Elliptic curve cryptography (ECC)

been questioned. Will parallel lines intersect far and far away? No one has actually seen it. So "parallel lines, never intersect" just assume (everyone think of junior high school learning parallel axiom, is not proven). Since it is possible to assume that parallel lines never intersect, you can also assume that parallel lines intersect far and far away. That is, parallel lines intersect at Infinity Point p∞ (Please close your eyes, imagine that

Erlang learning: eunit testing for gen_fsm

), ?assertEqual(ok,tradepost:seller_insertitem(Pid,playstation, seller_password)), ?assertEqual(item_received,tradepost:introspection_statename(Pid)), ?assertEqual([playstation,undefined,seller_password,undefined, undefined],tradepost:introspection_loopdata(Pid)) end.withdraw_item(Pid) -> fun() ->

Introduction to ECC Encryption algorithm introduction

understanding of the public key algorithm. "The foundation of Modern Algebra" "Elementary Number Theory" and other books, it is better for you to flip first, which is helpful for you to understand this article. Don't be afraid, I will try to make the language more popular, I hope this article can become a stepping stone to learn ECC. First, from the parallel line talk about. Parallel lines, never intersect. No one doubted: but in modern times the conclusion was questioned. Will parallel lines

JS operator type conversion encyclopedia (front side of the question operator)

*nan);//nan Console.dir (5*null); 0 Console.dir (5*undefined);//nan Console.dir (5*5);//25 Here are the multiplication implicit conversion principles: 1, if 2 numeric values are numbers, then direct multiplication, (I believe everyone will, and primary mathematics, as well as to pay attention to the number of symbols), if multiply charge number value than the ECMAScript range of numerical representation, Returns either Infinity

Why Null==0 is false in JavaScript and null>=0 to True

when there is a certain harvest it. Above all is the personal opinion, if has any understanding not to be in place, welcome to propose, everybody studies together ha. Attach some reference = 0 ' 0 ' [0] [] {} ' NULL [NULL] undefined NaN [NaN] ' A ' Infinity 1 ' 1 ' [1] 0 true true true true

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