How to use 'js string remove substring' in JavaScript

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188function StringDropFirstSubstring() {
189 var sum = "";
191 for (var j = 0; j < subjects.length; ++j) {
192 let s = subjects[j];
193 sum += s.substring(1, s.length-1);
194 }
196 return sum;

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84function containsSubstring(str, substr) {
85 return str.indexOf(substr) > -1;

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