undefined; NaN; empty string (""); 0; false. The above list represents all possible falsy values in ECMA-/Javascript. ... <看更多>

JavaScript null is a primitive type that contains a special value null . JavaScript uses the null value to represent the intentional absence of any object value ... ... <看更多>

When using function parameter defaulting the resulting javascript fails for null values. E.g.: (function len(val = ''): number { return ... ... <看更多>

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If you have worked with JavaScript (or quite a few other languages ... 1, The type annotation for increment tells us it is a function which ... ... <看更多>

Checkboxes have a "value", but that's the value submitted to the server (it default to "on" when checked, and nothing otherwise), ... ... <看更多>