Thread by @swapnakpanda

💜 JavaScript: Array's length vs String's length
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➊ Introduction

In JavaScript,

✧ Array is an Object whereas String is a primitive

✧ Despite String being a primitive, for easy operations it has a lot of methods and, properties

✧ String is considered as Array-Like

✧ Both Array and, String has a "length" property

➋ Array's length

✧ Unlike many other languages, JavaScript actually allows to modify an array's length manually.

✧ If we set a larger length, few blank spaces (holes) are added to the end.

✧ If we set a smaller length, elements are removed from the end.

➌ String's length

✧ String is immutable. Hence, in no way we could modify a String.

✧ String's length property is that's why immutable.

✧ When we try to set a new length, the operation is ignored.

➍ Final Words

✧ In JavaScript, Array's length property is allowed to modify manually. Either array is expanded or, truncated towards its end-side when we modify its length.

✧ In JavaScript, String is immutable and thus its length property as well. It can't be modified.

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