javascript 0 vs null

From your question title: if(val === null || val == ""). I can on...

From your question title: if(val === null || val == ""). I can only see that you forgot a = when attempting to strict-equality-compare val with the.

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If HasPrimitiveBase(V) is false, then let get be the [[Get]] internal metho...

If HasPrimitiveBase(V) is false, then let get be the [[Get]] internal method of base, So you get Number 0 instead of the truthiness boolean true.

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If your looking at this from a Javascript paradigm it may be confusing. Not...

If your looking at this from a Javascript paradigm it may be confusing. Note that 0, null and the empty string "" are values and thus contain.

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If the two operands are not of the same type, JavaScript converts the . Aga...

If the two operands are not of the same type, JavaScript converts the . Again this is false, so it converts 0 to null which is false, so then it.

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When you compare null for equality to 0, the result is false. If you force ...

When you compare null for equality to 0, the result is false. If you force null . The quick answer can be found in the difference between strict vs.

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null undefined NaN empty string ("") 0 false The set of "tru...

null undefined NaN empty string ("") 0 false The set of "truthy" and "falsey" values in JavaScript comes from the ToBoolean abstract operation.

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The value null represents the intentional absence of any object value. It i...

The value null represents the intentional absence of any object value. It is one of JavaScript's primitive values.

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Loose equality is one such context: null == A and undefined == A If v is -0...

Loose equality is one such context: null == A and undefined == A If v is -0, no change has been requested, and no error will be thrown.

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Anything in JavaScript can be considered either truthy or falsy. false; 0 (...

Anything in JavaScript can be considered either truthy or falsy. false; 0 (zero); '' or "" (empty string); null; undefined; NaN (e.g. the result of 1/0).

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This means that in JavaScript, isNaN(x) == true is equivalent to x - 0 to I...

This means that in JavaScript, isNaN(x) == true is equivalent to x - 0 to Infinity increment(null); // 1: null is converted to 0 increment(false); // 1.

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There are two operators for comparing values in JavaScript: strict equality...

There are two operators for comparing values in JavaScript: strict equality === and _ // any value including NaN x === x +0 === -0 undefined == null; One number, one string: convert the string to a number; A boolean and.

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(negated:!=) When using two equals signs for JavaScript equality testing, s...

(negated:!=) When using two equals signs for JavaScript equality testing, some funky conversions take place. true. false. 1. 0. "true". "false". "1". "0". "-1". "".

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Having `null` and `undefined` as two distinct things in JavaScript is If a ...

Having `null` and `undefined` as two distinct things in JavaScript is If a falsy value is a valid value (e.g. '', false, 0) then filter out both null and.

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You could say that its like an empty paper roll vs the paper roll not .. In...

You could say that its like an empty paper roll vs the paper roll not .. In JS 0!= null, but if used as an if condition they both evaluate to false.

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null and undefined are two special values in Javascript used to represent n...

null and undefined are two special values in Javascript used to represent null represents no value and when coerced, it will become 0.

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