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Jul 23, 2014 · In javascript the => is the symbol of an arrow function expression. A arrow function expression does not have its own this binding and therefore cannot be used as a constructor function. for example:
1. "Using the dollar sign is not very common in JavaScript, but professional programmers often use it as an alias for the main function in a JavaScript library. In the JavaScript library jQuery, for instance, the main function $ is used to select HTML elements. In jQuery $("p"); means "select all p elements".
Dec 6, 2015 · The modulus operator is used as follows: var1 % var2. The modulus operator returns the first operand modulo the second operand, that is, var1 modulo var2, in the preceding statement, where var1 and var2 are variables. The modulo function is the integer remainder of dividing var1 by var2. For example, 12 % 5 returns 2.
Feb 12, 2014 · The Symbol() is the data type, introduced with the release of ECMAScript 6 (ES6). There're two curious facts about the Symbol. the first data type and only data type in JavaScript which has got no literal. any variable, defined with Symbol(), gets unique content, but it's not really private.
Dec 27, 2010 · 92. Javascript has a bitwise XOR operator : ^. var nb = 5^9 // = 12. You can use it with booleans and it will give the result as a 0 or 1 (which you can convert back to boolean, e.g. result = !!(op1 ^ op2)). But as John said, it's equivalent to result = (op1 != op2), which is clearer. edited Sep 8, 2017 at 10:04.
Mar 19, 2019 · 2. \n is the newline (line feed) character, even if it is preceded by a carriage return. CR should never be used on its own, although most Windows apis and apps will parse it as a newline. LF works just as well in Windows too. CR is just an artifact from the time when computers were merely electronic typewriters.
Sep 12, 2015 · let unicodeDegCel = '℃'.codePointAt(0); This will return the integer 8451. Now use the JavaScript method fromCodePoint() prepended with String, using the character code retrieved from codePointAt(): let degreesCelcius = String.fromCodePoint(8451); This is was what eventually enabled me to use the degrees celcius symbol in ChartJS.
Dec 28, 2014 · 4. The backtick character (`) in JavaScript is used to define template literals. A template literal is a special type of string that allows you to embed expressions, which are evaluated and included in the final string. They are denoted by being surrounded by the backtick (`) character instead of single quotes (') or double quotes (").
Dec 11, 2008 · Reference: JavaScript Tutorial: Comparison Operators. The == operator will compare for equality after doing any necessary type conversions. The === operator will not do the conversion, so if two values are not the same type === will simply return false. Both are equally quick.
This primitive type is useful for so-called "private" and/or "unique" keys. Using a symbol, you know no one else who doesn't share this instance (instead of the string) will not be able to set a specific property on a map. Example without symbols: map.prop = "hey"; map.prop = "hey, version 2"; In this case, the 2nd function call will override ...
