Explain JSLint "Unexpected assignment expression."

[XP1]

Explain JSLint "Unexpected assignment expression."

Tolerate assignment expressions: true if assignment should be allowed outside of statement position

ass: true, if assignment expressions should be allowed

https://github.com/douglascrockford/JSLint/commit/abc0d34007353642b8a4a822627549c459070f8b

Example:

(function (console, window, HTMLElement) {
    "use strict";

    var children = [];

    var document = window.document;
    var element = document.body;
    while ((element = element.firstElementChild) instanceof HTMLElement) {
        children.push(element);
    }

    console.log(children);
}(this.console, this, this.HTMLElement));

[XP1]

JSLint discussion on Google+: https://plus.google.com/118095276221607585885/posts/WZwU74SvTZd

On May 2, 2013, Douglas Crockford said:

There is a new option, Tolerate assignment operators. Normally, assignment is allowed only in statement position. This option allows assignment in expression position. Use of this option is not recommended.

[jamesallardice]

Thanks, I'll get an article for this up as soon as I can. If you have enough information to write one yourself, please feel free to do so and open a pull request.

[jamesallardice]

http://jslinterrors.com/unexpected-assignment-expression