![]() ![]() You can also check out this handa JavaScript Cheat Sheet to know more about JS. That's it! If you have anything to add feel free to comment below. JavaScript employes Number.MAX_VALUE and Number.MIN_VALUE for this task and they work as expected. When these functions are called without arguments, Math.max() returns Infinity and Math.max() returns -Infinity. They are, instead, used to return maximum and minimum values within a group of numbers. Math.min is greater than Math.max > Math.min() > Math.max()Ī lot of programming languages define global maximum and minimum values and so does JavaScript, but not with Math.max() or Math.min(). Neither 0 nor null gets coerced and by rule, if such a case occurs, where the comparison doesn't fall into any category, false is returned. However, with the = operator, such a comparison doesn't fall into any category of rules defined for evaluation of expression by = operator. Null when converted to number type yields 0 which explains evaluation of the above statements. When using relational operators the comparison is similar to > 0 0 >= Number( null) When we compare 0 and null using relational operators, JavaScript coerces null into its primitive number type. It's just a fancy set of rules to evaluate an expression. JavaScript double equal operator and the relational operator are based on the abstract equality comparison algorithm and the abstract relational comparison algorithm. Explicit conversion of an empty object into number type yields NaN. This one is similar to the example above. Values such as false, null, undefined, NaN, 0, '' and "" are considered as falsy. Equality of an empty array and NOT empty array > = !īefore understanding what is happening above, we need to understand the concept of truthy and falsy in JavaScript and how the ! (logical NOT) operator works. ![]() If iterable is not specified, an empty deque object is created. However, if both the array instances have been same (like the one below), then the answer below would have been true. Over 70 recipes that uncover powerful programming tactics in Python Cody Jackson. The statement above is similar to: > var a = Ī and b are references to two different locations in memory, hence the result is false. The comparison above actually asks, "Is an instance of empty array equal to an instance of another empty array?" which is definitely false. Arrays are stored by references in JavaScript and in JavaScript, the double equal operator returns true only when you're comparing the same instances of the same type. An empty array is not equal to itself? But this is not what the above statement actually means. Understanding why these behaviors occur 1. Although this is a very powerful feature of the language, it might give rise to some unconventional situations. This means that variables can automatically be changed from one type to another while evaluating an expression. ![]() The = and = operators evaluate an expression using the abstract equality comparison algorithms and the strict equality comparison algorithm (more about it in this tutorial: = vs = JavaScript: Double Equals and Coercion These pitfalls generally arise due to properties such as type coercion and evaluation methodology of = & = operator. JavaScript is a powerful language, but there are certain syntactical and behavioral pitfalls in the language that a newcomer may fall for. ![]()
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