Possible Duplicate: Javascript === vs == : Does it matter which “equal” operator I use? What is the difference between == and === in JavaScript? I have also seen != and !== operators. Are there more such operators?...
I've been trying to understand the difference between JavaScript's comparison operators: identity and equality. From what I've read, if you check the equality of two objects using ==, JavaScript will try to figure out if they are the sa...
I've been reading Douglas Crockford's JavaScript: The Good Parts, and I came across this weird example that doesn't make sense to me: '' == '0' // false 0 == '' // true 0 == '0'...
The code: var num = 20; if(num == "20") { alert("It works"); } else { alert("Not working"); } The question: In C programming we have a rule name data type promotion, where when there's a mix of data type (exa...
A few weeks ago, I have read this thread Is < faster than <=? about comparison operators in C. It was said that there is no difference in the performance between < and <= as they are interpreted as same/similar machine commands. At the s...
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Ruby has something called a Combined Comparison or "Spaceship" Operator, it looks like this: <=> It does the following: a <=> b := if a < b then return -1 if a = b then return 0 if a > b then return 1 Credi...
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What am I missing here? This script looks right to me. But for some reason when I send it a zipcode of 02897 (or anything that should be Rhode Island), it returns New Hampshire. Aside from political beliefs Javascript developers may have (sure most...
I have this output in the console: console.log((!undefined)==(!false)) // true (fine) console.log((!!undefined)==(!!false)) // true (still fine) As I know, !!x==x, isn't it? console.log((undefined)==(false)) // false Can anyone tell me why...
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