Parseint typescript8/18/2023 Warning: unreachable code after return statement.Warning: -file- is being assigned a //# sourceMappingURL, but already has one.TypeError: X.prototype.y called on incompatible type.TypeError: setting getter-only property "x".TypeError: Reduce of empty array with no initial value.TypeError: property "x" is non-configurable and can't be deleted.TypeError: invalid assignment to const "x".TypeError: invalid 'instanceof' operand 'x'.TypeError: cannot use 'in' operator to search for 'x' in 'y'. TypeError: can't redefine non-configurable property "x".TypeError: can't delete non-configurable array element.TypeError: can't define property "x": "obj" is not extensible.TypeError: can't convert BigInt to number.TypeError: can't assign to property "x" on "y": not an object.TypeError: "x" is not a non-null object.Synta圎rror: Using to indicate sourceURL pragmas is deprecated.Synta圎rror: unterminated string literal.Synta圎rror: unparenthesized unary expression can't appear on the left-hand side of '**'.Synta圎rror: unlabeled break must be inside loop or switch.Synta圎rror: Unexpected '#' used outside of class body.Synta圎rror: test for equality (=) mistyped as assignment (=)?.Synta圎rror: redeclaration of formal parameter "x".Synta圎rror: missing = in const declaration.Unicode character class escape: \p after property list. Character class escape: \d, \D, \w, \W, \s, \S.Running benchmarks in Chrome, the performance benefit of parseInt over Math. The equivalent Math function would be unc: ParseInt doesn't do any rounding, only truncation. There are of course use cases where it’s beneficial to use it, for example if you want to extrapolate an integer out of a floating number, which is a good 50% faster than Math.round(). Just to give a broader picture as there are more ways to convert a string to a number, I also added tests using parseFloat and the Unary operator, here there results: Unless some specific cases, where parseInt returns what you need and Number doesn’t, for 99% of the cases you should better start to use the latter one. Or even if you want to convert a number from a decimal system to something else. No, not always, there are of course use cases where it’s beneficial to use it, for example if you want to extrapolate an integer out of a floating number, which is a good 50% faster than Math.round().įor example ifyou want to convert a string with pixels on it to just a number, like 32px to 32, then you should use parseInt, but most of the times you better stick with Number instead. So should I just avoid parseInt all the times? Sure, you are not going to run a loop of 100 millions, but it’s to make evident the performance difference between the two functions, and also when you use parseInt in multiple places on the same function, things might just sum up at the end. Enter fullscreen mode Exit fullscreen mode
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