JavaScript TypeError - 'X' is not iterable

This JavaScript exception is not iterable occurs if the value present at the right-hand-side of for…of or as argument of a function such as Promise.all or TypedArray.from, can not be iterated or is not an iterable object.

Message:

TypeError: 'x' is not iterable (Firefox, Chrome)
TypeError: 'x' is not a function or its return value is not iterable (Chrome)

Error Type:

TypeError

Cause of Error: Somewhere in the code, the value present at the right-hand-side of for…of or as argument of a function such as Promise.all or TypedArray.from, is used like it can be iterated or is an iterable object.

Example 1: In this example, the GFG_Obj is not iterable, So the error has occurred.

HTML

<script> 
    var GFG_Obj = { 'prop1': 'val1', 'prop2': 'val2' }; 
    // TypeError: GFG_Obj is not iterable 
    for (let x of GFG_Obj) {  
        // Do Anything. 
    } 
</script>

Output(in console):

TypeError: GFG_Obj is not iterable

Example 2: In this example, the GFG is not iterable, So the error has occurred.

HTML

<script> 
    function* GFG(a, b) { 
      yield a; 
      yield b; 
    } 
    // TypeError: GFG is not iterable 
    for (let y of GFG)  
        console.log(x); 
</script>

Output(in console):

TypeError: GFG is not iterable

My Personal Notes

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PranchalKatiyar

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