DashaScript programming languagePredefined Function

Predefined functions for string

parseNumber

Converts a string to a number.

Parameters

None

Returns

number - the integer part of a number by removing any fractional digits.

Examples

node some_node {
    do {
        #log("0.75e-1".parseNumber()); // 0.075
        #log("1E+3".parseNumber()); // 1000
        #log("10.289".parseNumber()); // 10.289
        #log("10".parseNumber()); // 10
        #log("X)".parseNumber().isNaN()); // true
    }
}

length

Returns the length of a string.

Parameters

None

Returns

number - the length of a string.

Examples

node some_node {
    do {
        #log("".length()); // 0
        #log("123456".length()); // 6
    }
}

repeat

Returns a new string which contains the repeatCount number of copies of the string. If repeatCount is 0, the empty string is returned.

Note:

negative value of repeatCount parameter will cause compile error

Parameters

Name	Type	Description
repeatCount	number	number of copies of the string

Returns

string - the repeated string

Examples

node some_node {
    do {
        #log("s".repeat(0)); // ""
        #log("s".repeat(4)); // "ssss"
    }
}

replaceFirst

Returns a new string with first found entry of searchString being replaced by replaceString.

The source string stays unmodified.

Parameters

Name	Type	Description
searchString	string	the substring that is to be replaced by `replaceString`
replaceString	string	the string that replaces the substring specified by the `searchString`

Returns

string - a new string with first found entry of searchString being replaced by replaceString.

Examples

node some_node {
    do {
        var str = "aaaa";
        #log(str.replaceFirst("aa", "b")); // "baa"
        #log(str); // "aaaa"
    }
}

replaceLast

Returns a new string with last found entry of searchString being replaced by replaceString.

The source string stays unmodified.

Parameters

Name	Type	Description
searchString	string	the substring that is to be replaced by `replaceString`
replaceString	string	the string that replaces the substring specified by the `searchString`

Returns

string - a new string with last found entry of searchString being replaced by replaceString.

Examples

node some_node {
    do {
        var str = "aaaa";
        #log(str.replaceLast("aa", "b")); // "aab"
        #log(str); // "aaaa"
    }
}

replaceAll

Returns a new string with all found entries of searchString being replaced by replaceString.

The source string stays unmodified.

Parameters

Name	Type	Description
searchString	string	the substring that is to be replaced by `replaceString`
replaceString	string	the string that replaces the substring specified by the `searchString`

Returns

string - a new string with all found entries of searchString being replaced by replaceString.

Examples

node some_node {
    do {
        var str = "aaaa";
        #log(str.replaceAll("aa", "b")); // "bb"
        #log(str); // "aaaa"
    }
}

reverse

Returns a new string with chars of the source string in reversed order.

Parameters

None

Returns

string - a new string with chars of the source string in reversed order.

Examples

node some_node {
    do {
        var str = "abc";
        #log(str.reverse()); // "cba"
        #log(str); // "abc"
    }
}

slice

Returns a copy of a section extracted from the string. Input parameters start and end define the section of the string as the range [start,end).

A negative value of an index (start or end) means an offset from the end of the array (please, see the examples).

If start is omitted than slice will extract elements starting from the index 0.

If end is omitted or end >= array.length() than slice will extract elements through to the end of array.

Note:

the float value of an index will be truncated to integer value.

Parameters

Name	Type	Description
start	number?	integer index at which to start the extraction
end	number?	integer index at which to end the extraction (not including)

Returns

string - a new string containing the extracted elements.

Examples

node some_node {
    do {
        var str = "123456";
        #log(str.slice()); // "123456"
        #log(str.slice(2,4)); // "34"
        #log(str.slice(2)); // "3456"
        #log(str.slice(-2)); // "56"
        // 2.9 is truncated to 2
        #log(str.slice(2.9)); // "3456"
        #log(str.slice(2,10)); // "3456"
    }
}

toLowerCase

Return a new string with all the alphabetic chars being converted to lowercase.

The source string stays unmodified.

Parameters

None

Returns

string - a new string with all the alphabetic chars being converted to lowercase.

Examples

node some_node {
    do {
        var str = "AA  aa";
        #log(str.toLowerCase()); // "aa  aa"
        #log(str); // "AA  aa"
    }
}

toUpperCase

Return a new string with all the alphabetic chars being converted to uppercase.

The source string stays unmodified.

Parameters

None

Returns

string - a new string with all the alphabetic chars being converted to uppercase.

Examples

node some_node {
    do {
        var str = "AA  aa";
        #log(str.toUpperCase()); // "AA  AA"
        #log(str); // "AA  aa"
    }
}

trim

Returns a new string with leading and trailing whitespaces being removed.

The source string stays unmodified.

Parameters

None

Returns

string - a new string with leading and trailing whitespaces being removed.

Examples

node some_node {
    do {
        var str = "  sss      ";
        #log(str.trim()); // "sss"
        #log(str); // "  sss      "
    }
}

trimEnd

Returns a new string with trailing whitespaces being removed.

The source string stays unmodified.

Parameters

None

Returns

string - a new string with trailing whitespaces being removed.

Examples

node some_node {
    do {
        var str = "  sss      ";
        #log(str.trimEnd()); // "  sss"
        #log(str); // "  sss      "
    }
}

trimStart

Returns a new string with leading whitespaces being removed.

The source string stays unmodified.

Parameters

None

Returns

string - a new string with leading whitespaces being removed.

Examples

node some_node {
    do {
        var str = "  sss      ";
        #log(str.trimStart()); // "sss      "
        #log(str); // "  sss      "
    }
}

concat

Returns a new string with elements of values being concatenated with the value of a string.

Parameters

Name	Type	Description
values	string[]	strings being concatenated with the calling string

Returns

string - a new string with elements of values being concatenated with the value of a string.

Examples

node some_node {
    do {
        var str = "hello?";
        #log(str.concat([" is", " there", " anybody", " in", " there?"])); // "hello? is there anybody in there?"
    }
}

startsWith

Returns true if a string sliced from the position begins with the characters of a searchString parameter, false otherwise.

Parameters

Name	Type	Description
searchString	string	the characters to be searched for in a string
position	number?	the index at which to start the search

Returns

true if a string sliced from position to the end begins with the characters of a searchString parameter, false otherwise.

Examples

node some_node {
    do {
        var str = "Just nod if you can hear me";
        #log(str.startsWith("Just")); // true
        #log(str.startsWith("nod")); // false
        #log(str.startsWith("nod", 5)); // true
    }
}

includes

Returns true if there is an entry of searchString in a string sliced from the position, false otherwise.

Parameters

Name	Type	Description
searchString	string	the characters to be searched for in a string
position	number?	the index at which to start the search

Returns

true if there is an entry of searchString in a string sliced from the position to the end, false otherwise.

Examples

node some_node {
    do {
        var str = "Just nod if you can hear me";
        #log(str.includes("you")); // true
        #log(str.includes("you", -15)); // false
        #log(str.includes("you", 15)); // true
    }
}

endsWith

Returns true if a string sliced from the position begins with the characters of a searchString parameter, false otherwise.

Parameters

Name	Type	Description
searchString	string	the characters to be searched for in a string
position	number?	the index at which to start the search

Returns

true if there is an entry of searchString in a string sliced from the position to the end, false otherwise.

Examples

node some_node {
    do {
        var str = "Just nod if you can hear me";
        #log(str.endsWith("me")); // true
        #log(str.endsWith("nod")); // false
    }
}

split

Splits a string into an ordered list of substrings, puts these substrings into an array, and returns the array.

If separator contains multiple characters, that entire character sequence must be found in order to split.

If separator appears at the beginning (or end) of the string, it still has the effect of splitting. The result is an empty (i.e. zero length) string, which appears at the first (or last) position of the returned array.

If separator is an empty string (""), the string is converted to an array of each of its UTF-16 "characters".

If limit is omitted than the string will be divided as many times as possible.

Parameters

Name	Type	Description
separator	string	the pattern describing where each split should occur
limit	number?	a non-negative integer specifying a limit on the number of substrings to be included in the array

Returns

string[] - array of separated substrings

Examples

node some_node {
    do {
        var str = "Is there anyone at home?";
        #log(str.split("not_found")); // ["Is there anyone at home?"]
        #log(str.split(" ")); // ["Is","there","anyone","at","home?"]
    }
}

indexOf

Returns the position of the first occurrence of a substring. Returns -1 if the value is not found.

Parameters

Name	Type	Description
searchString	string	the characters to be searched for in a string
position	number?	the index at which to start the search

Returns

number the position of the first occurrence of a substring, -1 if the value is not found.

Examples

node some_node {
    do {
        var str = "012345674";
        #log(str.indexOf("not_found")); // -1
        #log(str.indexOf("4")); // 4
        #log(str.indexOf("0", 1)); // -1
    }
}

lastIndexOf

Returns the position of the last occurrence of a substring. Returns -1 if the value is not found.

Parameters

Name	Type	Description
searchString	string	the characters to be searched for in a string
position	number?	the index of the last character in the string to be considered as the beginning of a match

Returns

number - the position of the last occurrence of a substring, -1 if the value is not found.

Examples

node some_node {
    do {
        var str = "012345674";
        #log(str.lastIndexOf("not_found")); // -1
        #log(str.lastIndexOf("4")); // 8
        #log(str.lastIndexOf("1", 0)); // -1
    }
}

parseJSON

Parse a string as JSON.

Parameters

None

Returns

unknown? - value or object corresponding to the given JSON text, or null if the string contains invalid JSON syntax.

Note:

The return type is unknown? because the structure depends on the parsed JSON content
You can use type assertions to work with the returned value in a type-safe manner

Examples

node some_node {
    do {
        // Parsing a valid JSON object
        var jsonString = #stringify({ a: 3, b: "foo" });
        var parsedObject = jsonString.parseJSON() as { a: number; b: string; };
        #log(parsedObject?.a); // 3
        #log(parsedObject?.b); // "foo"
        
        var invalidJson = "[invalidJSON";
        #log(invalidJson.parseJSON() is null); // true
    }
}

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