30秒学会 JavaScript 片段 – isSymbol
Checks if the given argument is a symbol. Use typeof to check if a value is classified as a symbol p...
Checks if the given argument is a symbol. Use typeof to check if a value is classified as a symbol p...
Casts the provided value as an array if it’s not one. Use Array.prototype.isArray() to determi...
Returns true if the specified value is null, false otherwise. Use the strict equality operator to ch...
Returns true if an object looks like a Promise, false otherwise. Check if the object is not null, it...
Checks if the given argument is a writable stream. Check if the value is different from null, use ty...
Returns true if the given object is not of the specified type, false otherwise. Use the is operator ...
Checks if a value is object-like. Check if the provided value is not null and its typeof is equal to...
Returns true if the given object is of the specified type, false otherwise. Use the is operator to c...
Returns the type of the given object. Use typeof() on the given object’s type.