I am being given data in an array that contains sub arrays and single elements. I do not know how many elements in the main array are sub arrays, or how many are single elements, or how many elements will be in a sub array, or where the sub arrays will be in the main array.
Is there a way I can detect the sub arrays or the single elements?
Example:
array[ [1,2,3], 4, 5]
Loop and check:
[1,2,[4,5],3].forEach((item, i) => {
if (Array.isArray(item)) {
console.log(`Item ${i} is an array!`); // Item 2 is an array!
}
})
Or map to booleans:
[1,2,[4,5],3].map(Array.isArray); // [false, false, true, false]
Using instanceof:
for(var i=0;i<your_array.length;i++){
if(your_array[i] instanceof Array){
console.log("Subarray!");
}else{
console.log("Not Subarray!");
}
}
You can use the operator typeof.
typeof 1; //number
typeof 'hola'; //string
Although you keep warning in that typeof array is object. So you need check the class using instanceof method (or the static method Array.isArray(your_variable)). For this issue you can read this question (How do you check if a variable is an array in JavaScript?).
In your particular case
[1, 2, 3, ['a','b']].forEach(function(element){
if(typeof(element) === 'number'){
//todo
}elseif(typeof(element) === 'string'){
//todo
}elseif(Array.isArray(element){
//todo array element
}
});
