30秒学会 JavaScript 片段 – isNil
Returns true if the specified value is null or undefined, false otherwise. Use the strict equality o...
Returns true if the specified value is null or undefined, false otherwise. Use the strict equality o...
Checks if the provided string is a valid JSON. Use JSON.parse() and a try… catch block to check if...
Checks if the provided argument is array-like (i.e. is iterable). Check if the provided argument is ...
Returns true if the given string can be parsed into a double, false otherwise. Return the result of ...
Compares two objects to determine if the first one contains equivalent property values to the second...
Checks if the given argument is a readable stream. Check if the value is different from null, use ty...
Checks if the provided value is of the specified type. Ensure the value is not undefined or null usi...
Checks if the given argument is a string. Only works for string primitives. Use typeof to check if a...
Clones a regular expression. Use new RegExp(), RegExp.source and RegExp.flags to clone the given reg...
Returns a boolean determining if the passed value is an object or not. Uses the Object constructor t...