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I have the following statement:

arr.push([student.name,student.id]);

I want to add an if-else block in this statement so I could add student.name only if the if is true, something like:

arr.push([student.name if (validName(student.name))
         ,student.id]);

But this syntax is not valid. Is there a proper way to achieve this idea?

EDIT:

My array contains a lot of elements and I want to add to most of them (if not all of them) some kind of check. Something like:

    arr.push([student.name if (validName(student.name)),
              student.id   if (validId(student.id) && idContainsNine(student.id)),
              student.avg  if (student.avg !== 'undefined'),
              ...
              ]);

I push the values only if the if statement is true. If it false, it will not push it. for example if validName(student.name) returns false it will not push student.name in the array.


You could take a conditional operator and get only an array with valid values.

array.push(validName(student.name)
    ? [student.name, student.id]
    : [student.id]
);

An other approach is to use functions which return after a check either an array with the value or without.

For using this result, you need to spread the array and if it does not contain any element, it does not increase the length of the array.

cost 
    includeName = name => validName(name) ? [name] : [],
    includeId = id => validId(id) && idContainsNine(id) ? [id] : [],
    includeAVG = avg => avg !== 'undefined' ? [avg] : [];

arr.push([
    ...includeName(student.name),
    ...includeId(student.id),
    ...includeAVG(student.avg)
]);

Another solution could be to use an array of checks and return in case of unwanted items an own Symbol (if undefined or ``null` is a used value) and filter the array before pushing it to the result set.

const
    EMPTY = new Symbol('empty'),
    checkName = ({ name }) => validName(name) ? name : EMPTY,
    checkId = ({ id }) => validId(id) && idContainsNine(id) ? id : EMPTY,
    checkAVG = ({ avg }) => avg !== 'undefined' ? avg : EMPTY;


array.push([checkName, checkId, checkAVG]
    .map(fn => fn(student))
    .filter(v => v !== EMPTY)
);

The if/else Statements, This is the simplest version of the if statement: The block governed by the if is Your program could do this by using an if statement along with an else statement: main(String[] args) { int testscore = 76; char grade; if (testscore >= 90) { grade  The if/else statement defines two blocks of code to execute between open and closing curly braces {}. If the condition is true then the block of code inside the first curly braces is executed from top to bottom, exactly once.


Consider ternary operator.

arr.push([validName(student.name) ? student.name : '', student.id]);

Replace empty string value '' with what you want when you get invalid student.name.

Java if, ifelse Statement (With Examples), control flow statements in Java using Java if and ifelse statements with the Here, our program will do one task (task inside if block) if the test expression is class Ladder { public static void main(String[] args) { int number = 0; // checks if  Is any Transact-SQL statement or statement grouping as defined by using a statement block. Unless a statement block is used, the IF or ELSE condition can affect the performance of only one Transact-SQL statement. To define a statement block, use the control-of-flow keywords BEGIN and END. Remarks. An IFELSE construct can be used in batches


Use this one.It may help you.

arr.push([student.name,(student.id ? student.id : '')]);

Java If Else, Java has the following conditional statements: Use if to specify a block of code to be executed, if a specified condition is true. Use else to specify a block of code to be executed, if the same condition is false. Use else if to specify a new condition to test, if the first condition is false. This conditional statement is used to make a decision on whether the statements within the if block should be executed or not. If the expression evaluates to true (i.e. any non-zero value), all statements within that particular if block will be executed; If it evaluates to false (zero or 'x' or 'z'), the statements inside if block will not be


PHP Control Structures: If else, Switch Case, you have more than route block of code to execute depending on the value of the condition. You can use these conditions to perform different actions for different decisions. Java has the following conditional statements: Use if to specify a block of code to be executed, if a specified condition is true; Use else to specify a block of code to be executed, if the same condition is false


PHP ifelseelseif Statements, - selects one of many blocks of code to be executed. The if/else statement is a part of JavaScript's "Conditional" Statements, which are used to perform different actions based on different conditions. In JavaScript we have the following conditional statements: Use if to specify a block of code to be executed, if a specified condition is true


IF function, Statements · Java Programming Conditional blocks, Loop blocks Conditional blocks allow a program to take a different path depending on some condition(s). However, in this if-else-if* scenario - once an if statement condition matches, the further conditions are not evaluated. I have thought of an alternative design which achieves the above without if-else, but it is lengthier but at the same time more flexible.