javascript check if array is not empty

if (typeof array !== 'undefined' && array.length === 0) {
    // the array is defined and has no elements
}

4
5
Awgiedawgie 440220 points

                                    array.length = []

4 (5 Votes)
0
4
6
Phoenix Logan 186120 points

                                    if (array && !array.length) {
    // array is defined but has no element
}

4 (6 Votes)
0
4
4
Krish 100200 points

                                    // To safely test if the array referenced by variable “array” isn’t empty:

if (array && array.length) {    
   // not empty  
} else { 
   // empty 
} 
// Note that if “array” is assigned to some other object that isn’t an array, the code will still execute the “else” part.

// A possible improvement to check that the object is specifically an empty array might be this:

if (array && array.constructor === Array && array.length === 0) {    
   // strictly an empty array 
} else { 
   // either null, or not an array or not an empty array 
} 

4 (4 Votes)
0
4.38
8
Phoenix Logan 186120 points

                                    if (Array.isArray(array) && array.length) {
    // array exists and is not empty
}

4.38 (8 Votes)
0
4.11
9
Awgiedawgie 440220 points

                                    if (array === undefined || array.length == 0) {
    // array empty or does not exist
}

4.11 (9 Votes)
0
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