How to determine if Javascript array contains an object with an attribute that equals a given value?

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No need to reinvent the wheel loop, at least not explicitly (using arrow functions, modern browsers only):

if (vendors.filter(e => e.Name === 'Magenic').length > 0) {
  /* vendors contains the element we're looking for */
}

or, better yet, as it allows the browser to stop as soon as one element is found that matches, so it’s going to be faster:

if (vendors.some(e => e.Name === 'Magenic')) {
  /* vendors contains the element we're looking for */
}

EDIT: If you need compatibility with lousy browsers then your best bet is:

if (vendors.filter(function(e) { return e.Name === 'Magenic'; }).length > 0) {
  /* vendors contains the element we're looking for */
}

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