Issue #173 (Array.slice, CSS/HTML, Testing, Uncats)
The first argument represents where to begin slicing in the array and, somewhat confusingly, the second argument represents the slot after the slice's ending position. Some simple examples:
var array = ['one', 'two', 'three', 'four', 'five'];
console.log(array.slice(2)); // ["three", "four", "five"]
console.log(array.slice(2, 4)); // ["three", "four"]
console.log(array.slice(1, 3)); // ["two", "three"]
As you can see, if you include only one argument, the second argument is assumed to be the length of the array, so it will grab everything from the start point on.
But interestingly, you can also use negative numbers for either of the arguments. So the following does a bit of a bizarre extraction:
console.log(array.slice(-4, -1)); // ["two", "three", "four"]
In that case I'm extracting the middle three elements in the array using negative values for start/end. But the most useful technique using negative values is when you use a single argument. This allows you to extract the specified number of elements from the back of the array, but still in the order they appear inside the array:
console.log(array.slice(-4)); // ["two", "three", "four", "five"]
console.log(array.slice(-2)); // ["four", "five"]
Demo with all examples
More info on Array.slice on MDN and, as mentioned, this is safe to use in all browsers.
Now on to this week's tools!
CSS and HTML Tools
A pure CSS icon set with one-click options to view on CodePen and the ability to create a CodePen example animating one icon into another.
Critical Style Snapshot
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HTML Div Table Generator
Tool to generate HTML table code with option to convert to, or generate divs with table styles.
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Testing and Debugging Tools
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Chrome extension. All-in-one development and profiling with options for rewrite and proxy rules.
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Web Bloat Score Calculator
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"Simplify your testing. Easily generate fake data for populating your mockups and testing your applications."
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"An email-based, passwordless authentication service that you can host yourself."
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A Tweet for Thought
Dan Abramov discusses some myths and misunderstandings of DRY code.
Suggestions / Corrections
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Before I Go...
How Much to Make is a set of three tools to help you calculate the cost of an app, website, or logo. Not sure how accurate these are, but it might be a guide for those not sure how to price their work.
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