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What is entries() in Node.js Buffer module?

Hammad Nasir

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The entries function in Node.js Buffer module

The entries function is a member function of the Buffer class in the Node.js Buffer module. The entries function, when called on an instance of Buffer, returns an Iterator, which contains a key-value pair for the buffer. The syntax of the entries function is as follows:

buf.entries()

Parameters

entries takes no parameters.

Return value

  • Returns an Iterator for key-value pairs of buf.

Description

The entries function creates and returns an index Iterator for the key-value pair of the buffer buf.

Example usage of the entries function

The following code snippet provides an example of how to use the entries function:

const b = Buffer.from('Hello World!');
for (const pair of b.entries()) {
console.log(pair);
}

In the above example, b is a Buffer instance of length 12 that contains the bytes for the string Hello World!. The b.entries() function returns an Iterator which is stored in pair. In every iteration of the for loop, the value of pair is printed, which is basically a length 2 array. The first element denotes the index of the buffer and the second element denotes the value at that index.

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Hammad Nasir
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Grokking Modern System Design Interview for Engineers & Managers

Ace your System Design Interview and take your career to the next level. Learn to handle the design of applications like Netflix, Quora, Facebook, Uber, and many more in a 45-min interview. Learn the RESHADED framework for architecting web-scale applications by determining requirements, constraints, and assumptions before diving into a step-by-step design process.

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