substr() javascript
const str = 'substr';
console.log(str.substr(1, 2)); // (1, 2): ub
console.log(str.substr(1)); // (1): ubstr
/* Percorrendo de trás para frente */
console.log(str.substr(-3, 2)); // (-3, 2): st
console.log(str.substr(-3)); // (-3): strjava subscript
// Java Subscript Numbers
// Base Char Code
0 ₀ \u2080
1 ₁ \u2081
2 ₂ \u2082
3 ₃ \u2083
4 ₄ \u2084
5 ₅ \u2085
6 ₆ \u2086
7 ₇ \u2087
8 ₈ \u2088
9 ₉ \u2089js substr
//str.substr(start[, length])
var str = 'abcdefghij';
console.log('(1, 2): ' + str.substr(1, 2)); // '(1, 2): bc'
console.log('(-3, 2): ' + str.substr(-3, 2)); // '(-3, 2): hi'
console.log('(-3): ' + str.substr(-3)); // '(-3): hij'
console.log('(1): ' + str.substr(1)); // '(1): bcdefghij'
console.log('(-20, 2): ' + str.substr(-20, 2)); // '(-20, 2): ab'
console.log('(20, 2): ' + str.substr(20, 2)); // '(20, 2): 'Copyright © 2021 Codeinu
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