This content originally appeared on Go Make Things and was authored by Go Make Things
Today in the current session of Vanilla JS Academy, my students are working on a character and word count script.
My solution for counting words looks like this.
// Split the text content into an array, using spaces to break words
// Use Array.filter() to remove any words without a length
// (this removes double spaces in the content)
let words = text.value.split(' ').filter(function (word) {
return word.length;
});
One of my students has a solution that looks like this.
// Split the text content into an array, using spaces to break words
// Use Array.filter() to remove any words without a length
// (this removes double spaces in the content)
let words = text.value.split(' ').filter(function (word) {
return word.length > 0;
});
They asked me why return word.length works in my Array.filter() method even though it’s not explicitly checking to see if the word.length is greater than 0.
In JavaScript, a value of 0 is considered false for truthy evaluation purposes, and a number higher than that is considered true.
Because the word.length property returns an integer, starting at 0 and going up, the Array.filter() method evaluates it as true or false automatically.
I like it because it saves me a little typing, but if you find the more explicit comparison more clear, by all means use it.
This content originally appeared on Go Make Things and was authored by Go Make Things
Go Make Things | Sciencx (2021-10-15T14:30:00+00:00) Boolean shorthands and truthiness. Retrieved from https://www.scien.cx/2021/10/15/boolean-shorthands-and-truthiness/
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