How to use 'javascript insert character into string' in JavaScript

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107function insertString(s, index, value) {
108 if (!value) {
109 return s;
110 }
111 if (!index) {
112 return value + s;
113 }
114 return s.substr(0, index) + value + s.substr(index);
9function insertString(string, index, to) {
10 return string.slice(0, index) + to + string.slice(index);

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