Angular LowerCasePipe -
Angular provides a LowerCasePipe and it is used to transforms given a text to lowercase.
The expression with lowercase -
{{ value_expression | lowercase }}
The example as,
import { Component } from '@angular/core';
@Component({
  selector: 'lowercase-pipe',
  template: `<div>
    <input type="text" #name (keyup)="changeLowerCase(name.value)">
    <p>LowerCase - <h2>'{{value | lowercase}}'</h2>
  </div>`
})
export class LowerCasePipeComponent {
  value: string;
  changeLowerCase(value: string) {
    this.value = value;
  }
}
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