Question: What does indexOf return if not found TypeScript?

This method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex or -1 if the value is not found.

Why does indexOf return?

The reason it returns -1 instead of “false” is that a needle at the beginning of the string would be at position 0, which is equivalent to false in Javascript. So returning -1 ensures that you know there is not actually a match.

What does indexOf return in JavaScript?

The indexOf() method returns the position of the first occurrence of a specified value in a string. indexOf() returns -1 if the value is not found. indexOf() is case sensitive.

What is the use of indexOf in TypeScript?

TypeScript | String indexOf() Method

The indexOf() is an inbuilt function in TypeScript which is used to get the index within the calling String object of the first occurrence of the specified value.

What does indexOf return if not found?

indexOf() The indexOf() method returns the index within the calling String object of the first occurrence of the specified value, starting the search at fromIndex . Returns -1 if the value is not found.

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Does indexOf work with objects?

indexOf() method returns the index of the first matching item in an array (or -1 if it doesn’t exist). var wizards = [‘Gandalf’, ‘Radagast’, ‘Saruman’, ‘Alatar’]; // Returns 1 wizards. … But… that doesn’t work if the array contains objects instead of simple strings or numbers.

Can we iterate string in Java?

In this approach, we convert string to a character array using String. toCharArray() method. Then iterate the character array using for loop or for-each loop.

What is the difference between findIndex and indexOf?

findIndex – Returns the index of the first element in the array where predicate is true, and -1 otherwise. indexOf – Returns the index of the first occurrence of a value in an array.

Are movie indexes safe?

But pretty much “Yes”, it is very safe. Two reasons, legal and technical. Legal: The reason torrenting/file sharing software got people in legal trouble is because while downloading you were also uploading to other people.

How do substring () and substr () differ?

substr() Vs. substring()

The substr() method extracts parts of a string, beginning at the character at the specified position, and returns the specified number of characters. The substring() method returns the part of the string between the start and end indexes, or to the end of the string.

Is truthy in JavaScript?

In JavaScript, a truthy value is a value that is considered true when encountered in a Boolean context. All values are truthy unless they are defined as falsy (i.e., except for false , 0 , -0 , 0n , “” , null , undefined , and NaN ). JavaScript uses type coercion in Boolean contexts.

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What happens when JavaScript function reaches a return statement?

A return statement determines the value the function returns. When control comes across such a statement, it immediately jumps out of the current function and gives the returned value to the code that called the function. A return keyword without an expression after it will cause the function to return undefined .

What is TypeScript compiler?

Compiling TypeScript. TypeScript is a typed superset of JavaScript that compiles to plain JavaScript. It offers classes, modules, and interfaces to help you build robust components. The TypeScript language specification has full details about the language.

How do I use lastIndexOf in TypeScript?

TypeScript – String lastIndexOf()

  1. searchValue − A string representing the value to search for.
  2. fromIndex − The location within the calling string to start the search from. It can be any integer between 0 and the length of the string. The default value is 0.

What does indexOf do in angular?

indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.

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