If one operand is a string and the other is a number, attempt to convert the string into a number before checking for equality.A value of false converts to 0 whereas a value of true converts to 1. If an operand is a Boolean value, convert it into a numeric value before checking for equality.When performing conversions, follow these basic rules: The not equal operator is the exclamation point followed by an equal sign (!=), and it returns true if operands are not equal.īoth operators do conversions in order to determine if two operands are equal. The equal operator in JavaScript is the double equal sign (=), and it returns true if both operands are equal. Want to brush up on your modern JavaScript syntax? Check out my interactive cheatsheet: es6cheatsheet.Equal and Not Equal : Relational Operators « Operators « JavaScript Tutorial
#Javascript does not equal software
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#Javascript does not equal how to
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Who am I and who do I help? I'm Swizec Teller and I turn coders into engineers with "Raw and honest from the heart!" writing. Have a burning question that you think I can answer? Hit me up on twitter and I'll do my best. Join 15,883+ engineers learning lessons from my "raw and honest from the heart" emails. ~ Ashish Kumar Your Name Your Email Your Address Subscribe now And wow always take away lessons with me. "Man, love your simple writing! Yours is the only newsletter I open and only blog that I give a fuck to read & scroll till the end. However, JavaScript is kind enough to always claim that NaN does not equal NaN, if for naught else than to remind us we are trying to do something stupid.Ĭan anyone tell me if other languages handle this differently? Just produce an error of some sort?Īlso, please share this post with your local JavaScript newbie, I die a little every time I see that sort of tweet. But in my naive understanding of these things it should produce random results.
probably something we simply agreed upon? Like how the 0th power is 1. Mathematically, I have no idea what the result should be.
Now, what could possibly be the result of comparing two undefinable numbers? In short, it represents an undefinable number. It's very handy for representing things like 0/0, different kinds of infinity and operations involving infinities. Thing is, NaN stands for "Not a Number" and if memory serves comes right out of IEEE754 floating point arithmetic. Is it really that strange or just a symptom of what the logical symbol NaN actually stands for? Counterintuitively, it would seem that NaN does not equal NaN.
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