Question: Please implement the below function in Javascript and name the source file as h2.js . Use test file h2.test.js to test your code. You need

Please implement the below function in Javascript and name the source file as h2.js. Use test file h2.test.js to test your code. You need to install the jest before testing your code.

A chainable function say() that accepts one string per call, but when called without arguments, returns the words previously passed, in order, separated by a single space.

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