JavaScriptJavaScript Statement Video Player is loading. Current Time0:00 / Duration-:- Loaded:0% 在程式設計中,如果我們想在滿足一個或多個特定條件時執行程式碼,那麼在這種情況下,我們會使用稱為if語句的東西。假設我們有一個整數陣列,我們想檢查陣列中是否存在數字20。我們通過在if語句中新增一個條件來做到...
If-Else Statement example 1. if (conditions) {true -->do this} else {false --> do this} if((age>=14)&&(age<19)){// logical conditionstatus="Eligible.";// executed if condition is true}else{// else block is optionalstatus="Not eligible.";// executed if condition is false} exam...
JavaScript else if StatementWe can use the else if keyword to check for multiple conditions.The syntax of the else if statement is:// check for first condition if (condition1) { // if body } // check for second condition else if (condition2){ // else if body } // if no condition...
Once a condition is found to be TRUE, the if-else statement will execute the corresponding code and not evaluate the conditions any further. If no condition is met, the else portion of the statement will be executed. It is important to note that the else if and else portions are optional...
if(1==="1") { alert("=== operator considers types of operands"); } Try it else condition Use else statement when you want to execute the code every time when if condition evaluates to false. The else statement must followiforelse ifstatement. Multiple else block is NOT allowed. ...
8.2 If the function body consists of a single statement returning an expression without side effects, omit the braces and use the implicit return. Otherwise, keep the braces and use a return statement. eslint: arrow-parens, arrow-body-style Why? Syntactic sugar. It reads well when multiple ...
Else if Statement Withifandelse, we can run blocks of code depending on whether a condition istrueorfalse. However, sometimes we might have multiple possible conditions and outputs, and need more than simply two options. One way to do this is with theelse ifstatement, which can evaluate mor...
For multiple conditions, you should consider using the switch statement if the conditions are based on string or numeric value equivalency: switch (expression) {casevalueA: // statements to execute ifexpressionevaluates tovalueAbreak; // skip over default casevalueB:// statements to execute ifexp...
If the condition evaluates to true , the statement statement1 is executed; if the condition evaluates to false , the statement statement2 is executed. The statement here may be a line of code, or it may be a code block (that is, multiple lines of code enclosed in a pair of curly ...
If multiple cases matches a case value, thefirstcase is selected. If no matching cases are found, the program continues to thedefaultlabel. If no default label is found, the program continues to the statement(s)after the switch. Strict Comparison ...