Let us start this guide by showing off the various assignment operators that JavaScript supports within its code. Using the table below, you can see each assignment operator and what they do. You can also use this to see the equivalent code to using the assignment operator. OperatorNameExample...
count // => 6: variable names are expressions, too. // Equality and relational operators test whether two values are equal, // unequal, less than, greater than, and so on. They evaluate to true or false. let x = 2, y = 3; // These = signs are assignment, not equality tests x...
Assignment with Operation Besides the normal = assignment operator, JavaScript supports a number of other assignment operators that provide shortcuts by combining assignment with some other operation. For example, the += operator performs addition and assignment. The following expression: total += sales...
// Operators act on values (the operands) to produce a new value.// Arithmetic operators are some of the simplest:3+2// => 5: addition3-2// => 1: subtraction3*2// => 6: multiplication3/2// => 1.5: divisionpoints[1].x- points[0].x// => 1: more complicated operands also ...
JavaScript supports =, ==, and === operators. Be sure you understand the differences between these assignment, equality, and strict equality operators, and be careful to use the correct one when coding! Although it is tempting to read all three operators as “equals,” it may help to reduc...
4.2 Use Array#push instead of direct assignment to add items to an array. const someStack = []; // bad someStack[someStack.length] = 'abracadabra'; // good someStack.push('abracadabra');4.3 Use array spreads ... to copy arrays. // bad const len = items.length; const itemsCopy =...
✔ Logical Assignment Operators (&&=||=??=) ✔ Numeric Separators (1_000) ✔AggregateError ✔Promise.any ✔String.prototype.replaceAll ✔WeakRef ✔FinalizationRegistry ✔ Class Fields ✔ RegExp Match Indices ✔ Top-level await ...
JavaScript Assignment Operators7 OperatorExampleSame AsResult = x = y x = 5 + = x + = y x = x + y x = 15 − = x− = y x = x−y x = 5 * = x* = y x = x*y x = 50 / = x/ = y x = x/y x = 2 % = x% = y x = x%y x = 0 The operators we ...
In JS, the equals and not equals operators are of lower precedence than less than et al. In Lua, all comparison operators are thesame precedence. Lua supportstail calls. Lua supportsassignment to a list of variables. While it isn't yet standard in Javascript, Mozilla's JS engine (and Ope...
14.1 var declarations get hoisted to the top of their closest enclosing function scope, their assignment does not. const and let declarations are blessed with a new concept called Temporal Dead Zones (TDZ). It’s important to know why typeof is no longer safe. // we know this wouldn’t ...