substr
Take some part of the this string to make a smaller string (substring).
"".substr(0, 0)You can copy a part of another string by getting a substring from it. A new substring is made by copying some amount of characters from the first string, starting at a beginning position.
You could make a new string that just has the word "there" from a bigger string that
says "Hello there!!!". To do that, the substring is copied from the character position of 6 in the first string and 5 characters are copied. It’s done like this:
let there = "Hello there!!!".substr(6, 5)If you want to have the substring copy to the end of the first string, you just use a starting
position and either don’t use the length parameter or set it to 0. This will copy all of the first string beginning at position 6. The substring will say "there!!!" in this case.
let there = "Hello there!!!".substr(6)
// - or -
let there = "Hello there!!!".substr(6, 0)Parameters
- start: a number which is the position to start copying from the original this string.
- length: (optional) a number which is the amount of characters to copy from the original string. If length is not included or set to
0, the rest of this string is copied beginning at start. If length is less than0, a string with nothing in it (empty string) is returned.
Returns
- a new string which is some part of the original string.
Example
Copy the nouns from the sentence into two smaller strings.
let sentence = "The mountains have snow"
let mountains = sentence.substr(4, 9)
let snow = sentence.substr(19)