How to use 'javascript insert variable 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);

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63function insert(str, index, value) {
64 return str.substr(0, index) + value + str.substr(index);

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