Typically, this means we need to use an if…else statement to determine if the item exists using the returned index.JS Tutorial JS HOME JS Introduction JS Where To JS Output JS Statements JS Syntax JS Comments JS Variables JS Let JS Const JS Operators JS Arithmetic JS Assignment JS Data Types JS Functions JS Objects JS Events JS Strings JS String Methods JS String Search JS String Templates JS Numbers JS BigInt JS Number Methods JS Number Properties JS Arrays JS Array Methods JS Array Sort JS Array Iteration JS Array Const JS Dates JS Date Formats JS Date Get Methods JS Date Set Methods JS Math JS Random JS Booleans JS Comparisons JS If Else JS Switch JS Loop For JS Loop For In JS Loop For Of JS Loop While JS Break JS Iterables JS Sets JS Maps JS Typeof JS Type Conversion JS Bitwise JS RegExp JS Precedence JS Errors JS Scope JS Hoisting JS Strict Mode JS this Keyword JS Arrow Function JS Classes JS Modules JS JSON JS Debugging JS Style Guide JS Best Practices JS Mistakes JS Performance JS Reserved Words In JavaScript, 0 is a falsy value, while numbers less than or greater than 0 are considered truthy. This method returns the index position of the item if it exists in the array and returns -1 if it does not. We can look up the existence of an item in an array using the Array.indexOf method. If (str != null & str != undefined & str != '') `)Īrray.indexOf shorthand using the bitwise operator
#Javascript does not equal shorthand how to#
The following example demonstrates how to use short-circuit evaluation: // Longhand This shorthand uses the logical OR operator || to assign a default value to a variable when the intended value is falsy. Short-circuit evaluationĪnother way to replace an if…else statement is with short-circuit evaluation. Once there are more than two outcomes to your condition, using if/else blocks are much easier to read. The ternary operator is great when you have single-line operations like assigning a value to a variable or returning a value based on two possible conditions. The following example demonstrates a traditional if…else statement and its shorthand equivalent using the ternary operator: // Longhand It replaces the traditional if…else statement. The ternary operator is one of the most popular shorthands in JavaScript and TypeScript. The only slight differences are in specifying the type in TypeScript, and the TypeScript constructor shorthand is exclusive to TypeScript.
Keep this in mind when using the following shorthands for expressions and operators in JavaScript and TypeScript.Īll shorthands available in JavaScript are available in the same syntax in TypeScript.
#Javascript does not equal shorthand code#
Our decision to use shorthands must not be detrimental to other desirable code characteristics.
So, it is important that your code is legible and conveys meaning and context to other developers. Concise code can sometimes be more confusing to read and update. Using shorthand code is not always the right decision when writing clean and scalable code. Implicit return using arrow function expressions.Array.indexOf shorthand using the bitwise operator.Read through these useful JavaScript and TypeScript shorthands or navigate to the one you’re looking for in the list below. We will also explore examples of how to use these shorthands. In this article, we will review 18 common JavaScript and TypeScript and shorthands. Shorthand code alternatives can help reduce lines of code, which is something we typically strive for. JavaScript and TypeScript share a number of useful shorthand alternatives for common code concepts. 18 JavaScript and TypeScript shorthands to knowĮditor’s note: This guide to the most useful JavaScript and TypeScript shorthands was last updated on 3 January 2023 to address errors in the code and include information about the satisfies operator introduced in TypeScript v4.9. When she's not writing code, she likes to read, listen to music, and put cute outfits together. Ibiyemi Adewakun Follow Ibiyemi is a full-stack developer from Lagos.
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