In JavaScript, you can negate a number (i.e. convert a positive number to negative, and a negative to positive) in the following ways: Using Unary Negation Operator;
"1" + 2 // => "12": concatenation after number-to-string 1 + {} // => "1[object Object]": concatenation after object-to-string true + true // => 2: addition after boolean-to-number 2 + null // => 2: addition after null converts to 0 2 + undefined // => NaN: additio...
Number.POSITIVE_INFINITY // Same value 1/0 // => Infinity Number.MAX_VALUE * 2 // => Infinity; overflow -Infinity // A negative number too big to represent Number.NEGATIVE_INFINITY // The same value -1/0 // => -Infinity -Number.MAX_VALUE * 2 // => -Infinity NaN // The not...
// JavaScript's most important datatype is the object.// An object is a collection of name/value pairs, or a string to value map.letbook = {// Objects are enclosed in curly braces.topic:"JavaScript",// The property "topic" has value "JavaScript."edition:7// The property "edition" ...
negative < zero < positive 这个很好理解. 但是 JS 中有一个奇葩叫 NaN 它是一个数字又不是一个数字. 它的特色是无论和什么数字比大小结果都是 false NaN > 0;//falseNaN < 0;//falseNaN > 1;//falseNaN < 1;//false 它不比任何数字大, 也不比任何数字小 ... JS...
JavaScript does not have a built-in method to convert an integer to an array of integers. Converting positive integers is easy. Therefore, if you don't have a requirement to account for negative integers, and need to only</e
Before we wrap up, let’s put your knowledge of JavaScript Function and Function Expressions to the test! Can you solve the following challenge? Challenge: Write a function to calculate the factorial of a number. The factorial of a non-negative integer n is the product of all positive ...
POSITIVE_INFINITY // Same value 1/0 // => Infinity Number.MAX_VALUE * 2 // => Infinity; overflow -Infinity // A negative number too big to represent Number.NEGATIVE_INFINITY // The same value -1/0 // => -Infinity -Number.MAX_VALUE * 2 // => -Infinity NaN // The not-a-...
Ultimately, "dirty" tests can (but not always) lead to false positive or false negative results. "Hanging" most often manifests itself if a server is still listening on a port, or a socket is still open, etc. It can also be something like a runaway setInterval(), or even an errant...
Determining the sign of a number is super easy now with ES6's Math.sign! It will indicate whether the number is positive, negative or zero...