SubString
String.substring ( start , end )
One argument, we get the string starting from the specified index Inclusive until the end of the string.
sText = "abcdef"
sSubText = sText.substring(2);
console.log(sSubText); // ab
Two arguments, we get the string starting from the first number to the end number Exclusive.
sText = "abcdef"
sSubText = sText.substring(0, 2);
console.log(sSubText); // ab
String.substr ( start , length )
sText.substr(0,3)
The second argument is the length
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